小数乘法口算题

五年级上册小数乘法口算题一、整数乘小数1.2×0.3 = 0.6。

-解析：2 乘以0.3，先算2×3 = 6，然后看因数中一共有一位小数，从积的右边起数出一位点上小数点，结果是0.6。

2.5×0.4 = 2。

-解析：5×4 = 20，因数中一共有一位小数，结果是2。

二、小数乘小数3. 0.2×0.3 = 0.06。

-解析：先算2×3 = 6，两个因数一共有两位小数，从积的右边起数出两位点上小数点，结果是0.06。

4. 0.5×0.6 = 0.3。

-解析：5×6 = 30，因数中一共有两位小数，结果是0.3。

三、不同位数小数相乘5. 0.4×0.03 = 0.012。

-解析：4×3 = 12，因数中一共有三位小数，结果是0.012。

6. 0.02×0.5 = 0.01。

-解析：2×5 = 10，因数中一共有三位小数，结果是0.01。

四、含一位整数的小数乘法7.3×0.25 = 0.75。

-解析：3×25 = 75，因数中一共有两位小数，结果是0.75。

8.4×0.12 = 0.48。

-解析：4×12 = 48，因数中一共有两位小数，结果是0.48。

五、积的末尾有0 的情况9. 0.5×0.8 = 0.40 = 0.4。

-解析：5×8 = 40，因数中一共有两位小数，结果是0.40，小数末尾的0 可以去掉，结果是0.4。

10. 0.2×0.25 = 0.050 = 0.05。

-解析：2×25 = 50，因数中一共有三位小数，结果是0.050，小数末尾的0 可以去掉，结果是0.05。

六、较大数乘小数11.12×0.3 = 3.6。

-解析：12×3 = 36，因数中一共有一位小数，结果是3.6。

20 道小数加减乘除口算题一、小数加法1. 0.5 + 0.3 = 0.8-解析：十分位上5 + 3 = 8，个位都是0，所以结果是0.8。

2. 1.2 + 0.7 = 1.9-解析：十分位上2 + 7 = 9，个位1 + 0 = 1，结果是1.9。

3. 2.6 + 1.3 = 3.9-解析：十分位上6 + 3 = 9，个位2 + 1 = 3，结果是3.9。

二、小数减法1. 0.8 - 0.3 = 0.5-解析：十分位上8 - 3 = 5，个位都是0，结果是0.5。

2. 1.5 - 0.7 = 0.8-解析：十分位上5 不够减7，向个位借1 当10，15 - 7 = 8，个位0 被借走1 变为-1，结果是0.8。

3. 2.4 - 1.2 = 1.2-解析：十分位上4 - 2 = 2，个位2 - 1 = 1，结果是1.2。

三、小数乘法1. 0.5×0.3 = 0.15-解析：5×3 = 15，两个因数一共有两位小数，所以结果是0.15。

2. 1.2×0.4 = 0.48-解析：12×4 = 48，两个因数一共有两位小数，结果是0.48。

3. 2.5×0.4 = 1-解析：25×4 = 100，两个因数一共有两位小数，结果是1。

四、小数除法1. 0.6÷0.2 = 3-解析：根据除法的性质，6÷2 = 3，所以0.6÷0.2 = 3。

2. 1.2÷0.3 = 4-解析：12÷3 = 4，所以1.2÷0.3 = 4。

3. 2.4÷0.6 = 4-解析：24÷6 = 4，所以2.4÷0.6 = 4。

4. 0.8÷0.4 = 2-解析：8÷4 = 2，所以0.8÷0.4 = 2。

5. 1.5÷0.5 = 36. 2.1÷0.7 = 3-解析：21÷7 = 3，所以2.1÷0.7 = 3。

小数乘法口算500道+竖式300道（含答案）小数乘法口算500道+竖式300道第一部分口算500道一．计算题（共50小题）1.直接写得数．0.5×1.4=80×0.125= 2.5×0.4=0.036×100=0.24×5=0.12×0.5=35÷1000= 2.2×0.5=0.12×5=0.04×0.1= 3.5+0.15=8﹣6.9=2．口算．0.4×5 1.2×44×1.51×0.50.01×0.1 1.25×0.40.36×0.20.8×03．直接写出得数．0.12×6= 1.25×0.4=30×0.8=12.5×0.8= 3.73﹣0.8﹣1.73= 3.26×0= 3.25+0.74= 5.2﹣2.64=0.24×5=4×0.05×2=3.9+7.1= 6.2×0.5=0.25×0.4=0.036×100= 3.64+6.36+5.5= 4．直接写出得数．0.4×0.02= 1.8×0.4=6×0.25= 1.25×0.8=3﹣0.98=0.9÷0.01= 3.9×0.01=99×0.25= 5．直接写得数：0.5×3=0.45+0.4=4×0.25=10.2+11.3= 0.09×100=8.7﹣0.5=0.96﹣0.7=12.9﹣2.9= 3.69×0=38.7÷10=6．直接写得数：0.2×3=0.45+0.4=4×0.25=18.7+11.3=0.09×100=8.7﹣0.5=0.96﹣0.7=18﹣1.67=1×8.79= 3.69×0=38.7÷10=2÷100=7．直接写出得数．0.28×10=0.9×5=8×0.06=0.05×1.6= 100×0.7= 2.5×8=1.06×7=12.5×0= 1.7+3.3×0.2=0.2×0.2×0.2=8．直接写得数：0.2×36=0.45×2=4×0.25= 3.8÷100=0.09×1000=1﹣0.9=0.96﹣0.7= 2.5×7.4×4= 9．口算0.2×0.4=8.2+1.8= 6.45×0.01= 2.5×0.4=0.8×50= 2.4×5=0.9﹣0.52=10.2×4.5= 10．直接写出得数．0.7×0.9=0.14×0.3= 1.7×0.03=0.12×6=5.5×10= 2.6×0.5= 1.8×0.04= 2.6×2﹣0.5= 11．直接写出得数．5×1.8=0.8×1.5=0.65+0.35=9.8+1.2=0.25×4=1﹣0.63=10.75﹣0.5= 1.25×80=1.7×0.9= 4.6×0.5= 1.42×100=19.8﹣8= 12．直接写出得数．0.25×4= 1.25×8=8.2×6.9×0=0.2×18=6.29×100=0.02×500= 3.4×2=0.26×0.5= 13．直接写得数0.2×4=0.8×25=0.57+0.43= 2.8×10=18.4÷100= 2.5×0.4= 4.7﹣1.78=0.125×8=1.8×0.5=0.035×1000=14．口算0.4×20= 1.3×3=0.25×50=0.9×300 2.4×50=0.125×200=600×0.4=800×0.25=1500×0.2=15．列竖式计算．2.3×0.8= 6.9×3.1=9.87×1.8=24.5×6.820.6×4.5=10.2×5.01=16．直接写得数．3.14×7=52=6π=62﹣20=402﹣302=b×b= 3.14×302= 3.14×42= 1.25×32=b+b=17．直接写得数．0.16×5= 4.2×0.3=25×0.4=2×0.45=0.5×0.07=0.3×0.7×10=18．口算题．0.1×208= 2.8×2=3×0.18=0.2×600= 1.3×5=8×0.05=1.3×50= 80×0.05=7.26×1=0.4×22=0.15×40=0.7×1.4=1.25×10=4.5×0.02=0.03×8=0×1.001=0.8×12.5=0.4×0.7= 1.3×4= 1.35×10=1.4×0.4=1.4×5= 1.45×100=3.5×40=0.02×38=25×0.4=1.6×1.5=0.01×10= 250×0.04=1.5×0.02=0.05×12=200×0.05=2.5×0.4=0.05×430=20×0.5= 250×0.4=7.682×0=2×0.005= 2.05×2=19．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4=0.3×0.3=0.35+0.75=0.48+1.62=10.1×78=20．直接写出得数．0.2×8= 6.2+0.04= 2.5×0.4=0.6×0.7=18.5+71.5= 6.4+4.6=0.04×0.3= 2.1﹣2.01= 1.41×1000=21．直接写出得数45+426=58.7﹣38.5= 2.25×8= 2.7×0.8= 6.4×0.8=320×0.03=11.004×50= 4.8×9.8= 22．口算．2.4×0.3=0.25×4=0.06×0.8=8.5×0.2= 1.25×0.8=7.5×0.5=6×4.4=0.13×0.05=19×0.7=23．口算：0.9×0.3= 3.5×0.2= 2.1×0= 6.6×10=0.3×7= 0.27×3=3×9.6=0.8×1.5=7.2×0.6= 2.5×0.4= 24．口算0.37×10=0.37×100=0.37×1000= 2.5×4= 0.25×4= 4.8×2=0.12×0.3=2×5.8= 0.28×3=0.16×4= 3.5×2=5×1.2= 5×1.5=3×0.25= 3.5×0.2= 3.5×5= 5×0.25=0.3×0.2= 3.5×0.5=3×1.5= 25．直接写得数．0.5×6=0.125×8= 2.5×0.4= 3.1×0.3=4×0.25= 1.25×6=0.2×0.05=0.8×0.05= 1.7×0.3=1.25×200=40×0.05=0.04×2=26．口算．0.2×50= 2.4×0.5=0.25×4= 3.2×0.3=12.5×80=0.17×10= 4.5+3.85= 2.5×0.7×0.4=3.5×8= 1.2×0.6= 5.2﹣2.8= 3.7+5.8=27．直接写得数．0.5×0.7= 2.1×0.4= 3.4×0.2=0.06×1.2=0.63×2=0.05×0.06=0.8×0.4=7.85×0.01= 0.15×0.4=1.3×30=0.25×0.6= 3.125×100= 28．直接写出得数．12.5×8= 2.5×0.4= 6.4+4.6=0.04×0.3=0.5×2.4=0.2×2.5= 5.18+3.02= 1.41×1000=29．口算：0.3×4= 2.3×0.2= 3.6+6.4=0.6×0.7=1.6×0.4=0.9×0.08=0.25×4=12.5×8= 0.7×0.9=0.04×0.2=0.8×0.05=3.1×0.3= 0.16×0.5= 1.7×0.03= 1.8×0.04=0.12×6= 30．直接写得数0.8×25=0×4.23=0.57+0.43=0.02×500=12.5×8=50×0.04=80×0.3= 1.1×9=31．直接写得数．0.7×10 3.02×100 3.6×2 4×1.52.5×4 12.5×0.8 4.5+2.6 7﹣1.66.4﹣2.3 10+6.01 8.3﹣1.37.3+2.7 32．口算9.5×0.2= 3.2×0.5=0.8×2.5= 4.4×0.4=35×0.4=33．口算．0.8×7=0.9×0.3= 1.32×8=10.3×2=3.5×0.2=10×0.05=0.13×7=0.05×4=30×0.1=12.5×8= 3.25×0=0.4×50= 34．直接写出得数：2.5×4= 2.4×0.5=8×0.125=0.27×3=7﹣6.38=0.22×0.5=35．直接写出得数．（后两题得数保留一位小数）0.7×0.9=0.14×0.3= 1.7×0.03= 1.8×0.04≈0.12×6= 5.5×10= 2.6×0.5= 2.6×0.08≈36．直接写出得数0.45×0.2= 4.38+3.5=0.9×7=（3.85+5.45）×0=0.75×1= 2.5×4= 5.4×20=7.5×0.4=37．口算．2.3×2=10×0.2= 1.45×10= 4.3×10═ 2.4×5=4.5×0.9= 2.5×8= 3.9×3=5×0.01=5.98×1000= 38．直接写得数：2.5×33.06×20.25×44.2×105.3×100 2.5×62.2×4 1.6×4 1.25×839．口算．1.5×8=2.4×5= 1.25×8=3.58×2=0.5×0.9=40．直接写得数0.7×0.9=0.12×50=60×0.5= 1.8×0.04=1.25×8=24×0.05=0.15×0.4=0.9×1.5=3.4×0.7=0.78×0.2=30×0.5=0.8×0.9=41．口算．0.5×0.2=50×0.2=500×0.2= 2.4×4= 2.5×0.4= 0.25×40=0.125×8=12.5×8= 1.25×80=0.24×5= 42．口算：0.5×2=0.25×4=12.5×8=0.125×8=7÷0.7=1﹣0.125×8= 1.25×32=0.25×56=43．直接写出得数．0.4×0.3= 2.5×0.6=8.8×0.1= 1.3×0.2=5.28+1.6=10﹣1.7﹣2.3=6.09×0=100×0.7=44．直接写出得数0.5×0.2=0.25×0.4= 1.25×8=0×1000+3=0.5÷100=0.12×40=100×0.78=12.78+0.22=0.6+0+0.7=0.72+1000=45．直接写得数．0.5×0.2=4×0.15=50×0.4=8×0.125=0.23×10=0.12×7=46．直接写出得数．0.7×0.9= 2.6×0.5=0.14×0.3= 5.5×10=1.7×0.03= 1.8×0.04=0.12×6= 4.8×5= 47．口算0.2×0.4=8.2+1.8=100﹣35.22= 2.5×0.4=0.8×50=8×0.24= 3.9×1.3= 2.4×5=0.9﹣0.52=0×3.52=12.5×8= 2.4×0.01= 48．直接写得数0.8×0.6= 5.5×3=0.5×0.6=0.125×0.8=9.6×0.1= 0.07×0.9=12.4×0.2= 2.4×5=14×0.01= 1.5×2= 49．口算．0.37×100=0.25×4=0.3×0.2=70×0.12=18×0.3=0.5×0.6= 3.7×0.2=5×1.2=第二部分竖式300道一．计算题（共50小题）1．列竖式计算．75﹣8.49= 3.72×1.25= 5.04×26=5.94+12.7=0.95×6.7=35.62﹣13.4=2．竖式计算0.64×18=25.8×102=40.7×0.25=13.45×2.6=（保留整数）4.865×8≈（保留整数）10.23×42≈（保留一位小数）3．竖式计算（前面有*要验算）．2.18×3.6*4.23×0.8620.07×1.0250.6×0.90.57×0.86*0.8×0.314．用竖式计算．8×0.12=（验算）1.9×3.5=（验算）0.401×0.3= 0.45×0.96=0.17×0.71=5．竖式计算4.57×1.8 0.125×0.8 3.75×0.249.37×8.52.07×3.6 3.35×1.6．6．列竖式计算：1.8×0.36=35.37+28.63=19.9﹣8.75=1.06×0.48=18.9+28.65=22.87﹣18.65=7．竖式计算7.6×0.82= 3.25×0.31=7.5×0.59=（验算）8．列竖式计算，带*号的要验算．25.78+3.12=13.8×9=*8﹣2.67=*5.73+6.7= 9．列竖式计算4.8×17 1.88×25 2.4×0.370.89×5.3．。

⼩数乘法计算600道（含答案）⼩数乘法计算600道第⼀部分⼀．计算题（共50⼩题）1．直接写出得数．0.4×0.02= 1.8×0.4=6×0.25= 1.25×0.8=3﹣0.98=0.9÷0.01= 3.9×0.01=99×0.25= 2．⽤竖式计算下⾯各题．2.4×1.5= 0.46×8.7=（保留⼀位⼩数） 2.24×1.8=（保留两位⼩数）3．⽤竖式计算．（得数保留两位⼩数）3.35×1.7≈ 5.63×3.9≈4．⽤竖式计算．2.97×3.5= 6.05×0.83= 0.78×4.5= 3.36×3.67=5．直接写得数．6.2×0.3= 2.5×0.8=0.06×5=0.16×25=5×2.1=0×48.76=6．⽤竖式计算（计算结果⼩数部分超过两位的，保留两位⼩数）．6.02×0.350.59÷1.4．7．按要求算⼀算．2.9×1.8 4.58×0.37 0.8×2.5（得数保留⼀位⼩数）5.45×1.72（得数保留两位⼩数）8．列竖式计算：1.8×0.85= 7.6﹣2.19= 50﹣18.75=9．⽤竖式计算．4.68×1.2= 1.58×2.5=10．竖式计算．1.35×270 6.4×8.05．11．⽤竖式计算．12．竖式计算．0.94×5.3= 0.91×2.6= 4.06×0.75（保留两位⼩数）≈0.25×4= 1.25×8=8.2×6.9×0=0.2×18= 6.29×100=0.02×500= 3.4×2=0.26×0.5= 14．我会⼝算．0.5×4.4=80÷1.6= 5.5÷0.11=0.06×5= 5×0.4×0.8=9.9+10.1= 1.25×0.8=0.08÷0.1= 4﹣0.15= 1.7×5+0.3×5=15．⼝算．3π=5π=5×3.14=0.5×7=92=62﹣32=4π﹣1.5π=34.6÷0.5=16．⽤竖式计算，得数保留⼀位⼩数．2.4×6.7≈3.5×0.5≈17．直接写出得数．0.8×25=0×4.23=0.57+0.43= 2.4×0.2=0.02×500= 2.8×10=8.29×100= 2.5×0.4= 4.87﹣1.7= 18．列竖式计算．0.64×12.5= 2.8×0.17=19．直接写出得数．0.7×0.9= 0.14×0.3= 5.5×10= 2.6×0.5=20．⽤竖式计算2.75×3.1= 3.18×5.45=0.76×2.18≈（得数保留两位⼩数）0.09×1.7≈（精确到⼗分位）21．列竖式计算0.36×0.15=（得数保留两位⼩数） 1.45×0.12=0.86×1.4=（得数保留⼀位⼩数） 6.5×0.39=22．⽤竖式计算．8×0.12= 1.9×3.5= 2.3×1.29=（验算）0.401×0.3=0.45×0.96=0.17×0.71=（得数保留两位⼩数）23．直接写得数．70×0.01= 2.515×10= 1.1×0.4=10﹢0.3= 6.5×0.2=0.1×0.01=0.87﹣0.6= 1.7×3= 24．竖式计算．（得数保留⼀位⼩数）0.38×0.23 5.79×3.6 4.6×0.25．25．竖式计算．3.6×0.25= 9.8﹣1.64= 3.1×300=26．⼝算．0.7×0.5= 3.6×2=0.4×1.7= 4.5×6=0.36+9= 5.7+3= 6.6×2=0.1×3.1= 27．直接写出计算结果0.3×1.1= 5.79+2.31+4.21=0.25×4= 1.2÷0.4=1.5×0.6= 1.59÷0.3=0.5×101= 6.5﹣5=0.6×0.7=0.8×5= 1.1×0.4=2.3×4×0=0.05×1.6=0.02×7=29．⽤竖式计算．0.32×0.8= 1.36×4.8= 17.3×0.06=30．⽤竖式计算．1.45×0.12= 3.08×0.28= 13.5×26.7= 3.15×0.35≈（保留⼀位⼩数）31．⼝算．9.37×0= 7.3×100= 289+72﹣89= 1﹣0.04= 4×8÷8×4=32．列竖式计算：30.5×0.76 0.54×0.19．33．直接写得数：2.5×33.06×2 0.25×44.2×105.3×100 2.5×62.2×4 1.6×4 1.25×834．竖式计算0.38×0.25= 0.12×15=8.5×0.39=（验算）0.87×1.5（保留⼆位⼩数）35．⽤竖式计算并验算．14.53+5.67 7.2﹣6.45 1.05×2.8 62.9÷1.7．36．⼝算：0.5×2=0.25×4=12.5×8=0.125×8=7÷0.7=1﹣0.125×8= 1.25×32=0.25×56= 37．⼝算0.2×0.4=8.2+1.8= 6.45×0.01= 2.5×0.4=0.8×50= 2.4×5=0.9﹣0.52=10.2×4.5=38．竖式计算，带*的要验算*4.23×0.02836×0.5631.5×24.50.8×0.56*0.63×1.05 1.8×3.6739．竖式计算35.4×0.8 7.63×1.2 0.08×1.14 3.17×2.8（得数保留两位⼩数）0.3×5.6（得数保留⼀位⼩数）54.3×0.7（得数保留整数）40．列竖式计算0×7= 2.6+0.4=15×0.01=21.2﹣21=1.8a+0.2a=0.4×0.4=0.12×0.04=0.8×100=2.5×4×0=0.72×0.8=42．⼝算．0.12×100= 6.2×10=500÷1000=12万+3万=8a+a= 6.2÷10=3.74×100=23.6÷100= 3.25×10=43．竖式计算0.18×12 3.26×15 3.1×17 1.25×4 14×0.5 8.4×15 0.45×9 1.5×35 0.02×13 4.28×16 2.61×1844．直接写出得数．40×1.2=25×0.4=63=7.8+0.9=0.56+4.44=2.4×0.5= 1.25×80=3.6÷0.06=12÷0.4=82=45．列竖式计算2.034×18 4.06×3.8 （积保留两位⼩数）46．计算4×38.2= 8×0.352= 35.6×5= 6.7×3=47．⼝算9.5×0.2= 3.2×0.5=0.8×2.5= 4.4×0.4=35×0.4= 4.8×50= 4.8×0.25=8.8×5= 1.4×0.5=12.5×4= 48．竖式计算．☆0.43×27= 1.85×2.6=验算：0.37×2.4≈（得数保留⼀位⼩数）7.02×0.56≈（得数保留两位⼩数）49．直接写出得数．0.7×0.9= 2.6×0.5=0.14×0.3= 5.5×10=1.7×0.03= 1.8×0.04=0.12×6= 4.8×5= 50．竖式计算．5.6×1.8= 0.25×0.046≈（保留两位⼩数）3500×0.96=第⼆部分⼀．计算题（共50⼩题）1．列竖式计算：1.8×0.36=35.37+28.63=19.9﹣8.75=1.06×0.48=18.9+28.65=22．⽤竖式计算下⾯各题．2.4×1.5= 0.46×8.7=（保留⼀位⼩数） 2.24×1.8=（保留两位⼩数）3．直接写得数．0.102×100= 4.2+3=0.23×0.5=0.25×7×0.4=3.6÷0.6=42=0.1÷0.01=2×0.5+1=4．⽤竖式计算（计算结果⼩数部分超过两位的，保留两位⼩数）．6.02×0.35 8.74÷3.8 0.59÷1.4．5．列竖式计算：1.8×0.85= 7.6﹣2.19= 50﹣18.75=6．⽤竖式计算．4.8×0.25 9.3×1.3 9.8×0.5 2.1×2.15．7．⽤竖式计算．（得数保留两位⼩数）3.35×1.7≈ 5.63×3.9≈8．直接写出得数．0.12×0.4= 3.8÷100=56.56÷0.56 1.6+3.04= 19.28﹣0.8= 2.8÷0.7=0.53×1000=108÷2.5÷4= 9．列竖式计算3.48×1.05（计算并验算） 1.55÷3.8（得数保留两位⼩数）10．竖式计算0.64×18=25.8×102=40.7×0.25=13.45×2.6=（保留整数） 4.865×8≈（保留整数）10.23×42≈（保留⼀位⼩数）11．直接写得数．6.2×0.3= 2.5×0.8=0.06×5=0.16×25=5×2.1=0×48.76=12．按要求算⼀算．2.9×1.8 4.58×0.370.8×2.5（得数保留⼀位⼩数） 5.45×1.72（得数保留两位⼩数）13．⽤竖式计算．84×0.25=0.55×64=0.47×5.8=6.06×0.32=0.075×0.07= 3.7×9.77=14．列竖式计算．3.4×0.25 6.5×2.4 0.035×0.6 1.25×0.024．2.97×3.5= 6.05×0.83= 0.78×4.5= 3.36×3.67= 16．⽤竖式计算．17．竖式计算4.57×1.8 0.125×0.8 3.75×0.249.37×8.5 2.07×3.6 3.35×1.6．0.94×5.3= 0.91×2.6= 4.06×0.75（保留两位⼩数）≈8.43×1.5= 0.25×3.2= 7.8×0.9（保留⼀位⼩数）≈19．我会⼝算．0.5×4.4=80÷1.6= 5.5÷0.11=0.06×5= 5×0.4×0.8=9.9+10.1= 1.25×0.8=0.08÷0.1= 4﹣0.15= 1.7×5+0.3×5= 20．列竖式计算，带*号的要验算．25.78+3.12= 13.8×9= *8﹣2.67= *5.73+6.7=21．直接写出得数．0.125×100=60÷100=9÷10=0.32+4.68= 15.7+4.3=25×4=10﹣0.8=7×99+7= 14.6+0.34=30.5+2.5=24﹣7.54﹣2.46=26+19+74+81= 22．⽤竖式计算．4.68×1.2= 1.58×2.5=2.4×6.7≈3.5×0.5≈24．竖式计算7.6×0.82= 3.25×0.31= 7.5×0.59=（验算）25．⼝算．3π=5π=5×3.14=0.5×7= 92=62﹣32=4π﹣1.5π=34.6÷0.5=26．直接写出得数．0.8×25=0×4.23=0.57+0.43= 2.4×0.2=0.02×500= 2.8×10= 8.29×100= 2.5×0.4= 4.87﹣1.7= 27．列竖式计算．0.64×12.5= 2.8×0.17=28．列竖式计算4.8×17 1.88×25 2.4×0.37 0.89×5.3．2.375×105 5.16×4.3 0.45×0.206．30．列竖式计算．0.04×0.12 4.25×8.8 3.84×0.25．31．竖式计算．3.6×0.25= 9.8﹣1.64= 3.1×300=32．⽤竖式计算2.75×3.1= 3.18×5.45=0.76×2.18≈（得数保留两位⼩数）0.09×1.7≈（精确到⼗分位）0.86×1.4=（得数保留⼀位⼩数） 6.5×0.39=34．⽤竖式计算．8×0.12= 1.9×3.5= 2.3×1.29=（验算）0.401×0.3=0.45×0.96=0.17×0.71=（得数保留两位⼩数）35．直接写出得数．0.7×0.9= 0.14×0.3= 5.5×10= 2.6×0.5=36．列竖式计算：30.5×0.76 0.54×0.19．37．竖式计算．1.35×270 6.4×8.05．38．直接写得数．70×0.01= 2.515×10= 1.1×0.4=10﹢0.3=6.5×0.2=0.1×0.01=0.87﹣0.6= 1.7×3= 39．列竖式计算24.6÷12 4.32÷1.2 21÷0.15．40．直接写出得数．0×7= 2.6+0.4=15×0.01=21.2﹣21=1.8a+0.2a=0.4×0.4=0.12×0.04=0.8×100=2.5×4×0=0.72×0.8=41．竖式计算．（得数保留⼀位⼩数）0.38×0.23 5.79×3.6 4.6×0.25．42．⽤竖式计算．0.32×0.8= 1.36×4.8= 17.3×0.06=43．竖式计算（*验算）8.4×0.15= 16.51﹣6.3= 900﹣4.58= *56.7+0.33=0.7×0.5= 3.6×2=0.4×1.7= 4.5×6=0.36+9= 5.7+3= 6.6×2=0.1×3.1= 45．⽤竖式计算．1.45×0.12= 3.08×0.28= 13.5×26.7=3.15×0.35≈（得数保留⼀位⼩数）46．竖式计算0.38×0.25= 0.12×15=8.5×0.39=（验算）0.87×1.5 （得数保留⼆位⼩数）0.3×1.1= 5.79+2.31+4.21=0.25×4= 1.2÷0.4=1.5×0.6= 1.59÷0.3=0.5×101= 6.5﹣5= 10﹣8.88﹣0.12=0.64÷1.6×1.5=。

第一部分：小数乘法口算1.直接写得数．0.5×1.4=80×0.125= 2.5×0.4=0.036×100= 0.24×5=0.12×0.5=35÷1000= 2.2×0.5= 0.12×5=0.04×0.1= 3.5+0.15=8﹣6.9=2．口算．0.4×5= 1.2×4=4×1.5=1×0.5=0.01×0.1= 1.25×0.4=0.36×0.2=0.8×0=3．直接写出得数．0.12×6= 1.25×0.4=30×0.8=12.5×0.8=3.26×0= 3.25+0.74= 5.2﹣2.64=0.24×5=3.9+7.1= 6.2×0.5=0.25×0.4=0.036×100= 4．直接写出得数．0.4×0.02= 1.8×0.4=6×0.25= 1.25×0.8=3﹣0.98=0.9÷0.01= 3.9×0.01=99×0.25=5．直接写得数：0.5×3=0.45+0.4=4×0.25=10.2+11.3=0.09×100=8.7﹣0.5=0.96﹣0.7=12.9﹣2.9=3.69×0= 38.7×10= 2.35×10= 1.25×0.8= 6．直接写得数：0.2×3=0.45+0.4=4×0.25=18.7+11.3=0.09×100=8.7﹣0.5=0.96﹣0.7=18﹣1.67=1×8.79= 3.69×0=38.7÷10=2÷100=7．直接写出得数．0.28×10=0.9×5=8×0.06=0.05×1.6= 100×0.7= 2.5×8= 1.06×7=12.5×0= 1.7+3.3×0.2= 0.2×0.2×0.2= 2.8+6.2= 1.235×100= 8．直接写得数：0.2×36=0.45×2=4×0.25= 3.8÷100= 0.09×1000=1﹣0.9=0.96﹣0.7= 2.5×7.4×4=9．口算0.2×0.4=8.2+1.8= 6.45×0.01= 2.5×0.4=0.8×50= 2.4×5=0.9﹣0.52=10.2×4.5= 10．直接写出得数．0.7×0.9=0.14×0.3= 1.7×0.03=0.12×6=5.5×10= 2.6×0.5= 1.8×0.04= 2.6×2﹣0.5=11．直接写出得数．5×1.8=0.8×1.5=0.65+0.35=9.8+1.2=0.25×4=1﹣0.63=10.75﹣0.5= 1.25×80=1.7×0.9= 4.6×0.5= 1.42×100=19.8﹣8= 12．直接写出得数．0.25×4= 1.25×8=8.2×6.9×0=0.2×18=6.29×100=0.02×500= 3.4×2=0.26×0.5= 13．直接写得数0.2×4=0.8×25=0.57+0.43= 2.8×10= 18.4÷100= 2.5×0.4= 4.7﹣1.78=0.125×8= 1.8×0.5= 0.035×1000= 3.8×8= 2.48-0.4=14．口算0.4×20= 1.3×3= 2.3×5= 0.25×50=0.9×300 2.4×50= 6.2×6= 0.125×200= 600×0.4=800×0.25= 3.14×5= 1500×0.2= 15．口算2.3×0.8= 6.9×3= 2.5×400= 9.87-1.8=4.5+6.8=20.6+4.5=12.5×8= 10.2-5.01= 16．直接写得数．3.14×7=52=6π=62﹣20=402﹣302= b×b= 3.14×302= 3.14×42= 1.25×32=b+b= 17．直接写得数．0.16×5= 4.2×0.3=25×0.4=25×0.4=2×0.45=0.5×0.07=0.3×0.7×10= 2.5×0.4= 1.3×5= 8×0.05= 1.3×50= 1.6×1.5=0.7×1.4= 1.25×10= 4.5×0.02= 0.05×430=1.3×4= 1.35×10= 1.4×0.4= 20×0.5= 18．口算题．0.1×208= 2.8×2=3×0.18=0.2×600= 80×0.05=7.26×1=0.4×22=0.15×40=0.03×8=0×1.001=0.8×12.5=0.4×0.7=1.4×5= 1.45×100= 3.5×40=0.02×38= 250×0.04= 1.5×0.02=0.05×12=200×0.05= 250×0.4=7.682×0=2×0.005=2.05×2= 19．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4= 0.3×0.3=0.35+0.75=0.48+1.62=10.1×78=20．直接写出得数．0.2×8= 6.2+0.04= 3.8×4= 2.5×0.4=0.6×0.7=18.5+71.5= 6.45-0.4= 6.4+4.6=0.04×0.3= 2.1﹣2.01=7.8×3= 1.41×1000= 21．直接写出得数45+426=58.7﹣38.5= 2.25×8= 2.7×0.8= 6.4×0.8=320×0.03=11.004×50= 4.8×9.8= 22．口算．2.4×0.3=0.25×4=3.8×5= 0.06×0.8= 8.5×0.2= 1.25×0.8=12.8×0.8= 7.5×0.5=6×4.4=0.13×0.05=0.2×3.8= 19×0.7= 23．口算：0.9×0.3= 3.5×0.2= 2.1×0= 6.6×10=0.3×7=0.27×3=3×9.6=0.8×1.5=7.2×0.6= 2.5×0.4= 24．口算0.37×10=0.37×100=0.37×1000= 2.5×4= 0.25×4= 4.8×2=0.12×0.3=2×5.8= 0.28×3=0.16×4= 3.5×2=5×1.2= 5×1.5=3×0.25= 3.5×0.2= 3.5×5= 5×0.25=0.3×0.2= 3.5×0.5=3×1.5= 25．直接写得数．0.5×6=0.125×8= 2.5×0.4= 3.1×0.3= 4×0.25= 1.25×6=0.2×0.05=0.8×0.05= 1.7×0.3= 1.25×200=40×0.05=0.04×2=0.2×50= 2.4×0.5=0.25×4= 3.2×0.3=12.5×80=0.17×10= 4.5+3.85= 2.5×0.7×0.4= 3.5×8= 1.2×0.6= 5.2﹣2.8= 3.7+5.8= 27．直接写得数．0.5×0.7= 2.1×0.4= 3.4×0.2=0.06×1.2=0.63×2=0.05×0.06=0.8×0.4=7.85×0.01= 0.15×0.4= 1.3×30=0.25×0.6= 3.125×100= 28．直接写出得数．12.5×8= 2.5×0.4= 6.4+4.6=0.04×0.3= 0.5×2.4=0.2×2.5= 5.18+3.02= 1.41×1000= 29．口算：0.3×4= 2.3×0.2= 3.6+6.4=0.6×0.7=1.6×0.4=0.9×0.08=0.25×4=12.5×8= 0.7×0.9=0.04×0.2=0.8×0.05=3.1×0.3= 0.16×0.5= 1.7×0.03= 1.8×0.04=0.12×6= 30．直接写得数0.8×25=0×4.23=0.57+0.43=0.02×500= 12.5×8=50×0.04=80×0.3= 1.1×9= 31．直接写得数．0.7×10 3.02×100 3.6×2 4×1.52.5×4 12.5×0.8 4.5+2.6 7﹣1.66.4﹣2.3 10+6.01 8.3﹣1.37.3+2.79.5×0.2= 3.2×0.5=0.8×2.5= 4.4×0.4= 4.8×50= 4.8×0.25=8.8×5= 1.4×0.5= 33．口算．0.8×7=0.9×0.3= 1.32×8=10.3×2= 3.5×0.2=10×0.05=0.13×7=0.05×4= 30×0.1=12.5×8= 3.25×0=0.4×50= 34．直接写出得数：2.5×4= 2.4×0.5=35×0.4= 8×0.125= 0.27×3=7﹣6.38=12.5×4= 0.22×0.5= 35．直接写出得数．（后两题得数保留一位小数）0.7×0.9=0.14×0.3= 1.7×0.03= 1.8×0.04≈0.12×6= 5.5×10= 2.6×0.5= 2.6×0.08≈36．直接写出得数0.45×0.2= 4.38+3.5=0.9×7=（3.85+5.45）×0= 0.75×1= 2.5×4= 5.4×20=7.5×0.4=37．口算．2.3×2=10×0.2= 1.45×10= 4.3×10=4.5×0.9= 2.5×8= 3.9×3=5×0.01= 38．直接写得数：2.5×3=3.06×2= 0.25×4= 3.8×26=4.2×10=5.3×100= 2.5×6= 2.5×40= 2.2×4 = 1.6×4= 1.25×8=7.5×6=1.5×8=2.4×5= 1.25×8=3.58×2=1.2×6=0.2×0.9=0.72×5=0.37×4=40．直接写得数0.7×0.9=0.12×50=60×0.5= 1.8×0.04=1.25×8=24×0.05=0.15×0.4=0.9×1.5=3.4×0.7=0.78×0.2=30×0.5=0.8×0.9= 41．口算．0.5×0.2=50×0.2=500×0.2= 2.4×4= 0.25×40=0.125×8=12.5×8= 1.25×80= 42．口算：0.5×2=0.25×4=12.5×8=0.125×8= 7÷0.7=1﹣0.125×8= 1.25×32=0.25×56= 43．直接写出得数．0.4×0.3= 2.5×0.6=8.8×0.1= 1.3×0.2=5.28+1.6=10﹣1.7﹣2.3=6.09×0=100×0.7= 44．直接写出得数0.5×0.2=0.25×0.4=7.3×6= 1.25×8=0×1000+3=0.5÷100= 2.6×4= 0.12×40= 100×0.78=12.78+0.22= 3.8×5= 0.6+0+0.7= 45．直接写得数．0.5×0.2=4×0.15=9.6×0.1= 50×0.4=8×0.125=0.23×10= 1.5×2= 0.12×7=46．直接写出得数．0.7×0.9= 2.6×0.5=0.14×0.3= 5.5×10=1.7×0.03= 1.8×0.04=0.12×6= 4.8×5=7.25×10= 0.12×40= 60×0.2= 3.6×200=47．口算0.2×0.4=8.2+1.8=100﹣35.22= 2.5×0.4= 0.8×50=8×0.24= 3.9×1.3= 2.4×5=0.9﹣0.52=0×3.52=12.5×8= 2.4×0.01=48．直接写得数0.8×0.6= 5.5×3=0.5×0.6=0.125×0.8=0.07×0.9=12.4×0.2= 2.4×5=14×0.01=1.08×2= 0.05×1.6= 13.7×2= 3.5×1.2= 49．口算．0.37×100=0.25×4=0.3×0.2=70×0.12= 18×0.3=0.5×0.6= 3.7×0.2=5×1.2= 7.52+2.48= 13.2-3.8-6.2= 12.8×3.2×0.8= 9×2.8= 50．口算．2.37×10= 1.25×88=0.8×1.2=50×1.2= 1.8×43=3.5×6= 3.72-2.7= 5.32-5.3= 7.65+0.4= 5.3+5.7=0.37-0.3= 1.3-0.08= 1.8×3=0.25×0.8= 3.25×4= 5.3×2.7=第二部分：小数乘法列竖式计算1．列竖式计算．75﹣8.49= 3.72×1.25= 5.04×26=5.94+12.7=0.95×6.7=35.62﹣13.4=2．竖式计算0.64×18=25.8×102=40.7×0.25=13.45×2.6=（保留整数） 4.865×8≈（保留整数）10.23×42≈（保留一位小数）3．竖式计算（前面有*要验算）．2.18×3.6*4.23×0.8620.07×1.025 0.6×0.90.57×0.86*0.8×0.314．用竖式计算．8×0.12=（验算） 1.9×3.5=（验算）0.401×0.3=0.45×0.96=0.17×0.71= 2.38×3.6=4.57×1.8 0.125×0.8 3.75×0.242.07×3.6 3.35×1.6．9.37×8.56．列竖式计算：1.8×0.36=35.37+28.63=19.9﹣8.75= 1.06×0.48=18.9+28.65=22.87﹣18.65=7.6×0.82= 3.25×0.31=7.5×0.59=（验算）8．列竖式计算，带*号的要验算．25.78+3.12=13.8×9=*8﹣2.67=*5.73+6.7=9．列竖式计算4.8×17 1.88×25 2.4×0.370.89×5.3．10．列竖式计算．3.8×0.15=4.6×50=8.7×2.04= 13.2×9.8=0.86×0.72=5﹣1.08=11．列竖式计算．（得数保留两位小数）2.375×105 5.16×4.3 0.45×0.206．12．用竖式计算．4.8×0.259.3×1.39.8×0.513．列竖式计算．0.04×0.12 4.25×8.8 3.84×0.25．14．用竖式计算．62.4+7.62= 6.07﹣4.993=8.7×1.4= 1.28×3.5=15．列竖式计算8×0.125 4.23×536.5×4 25×0.12618×1.833.42×2016．列竖式计算．2.3×0.8= 6.9×3.1=9.87×1.8= 24.5×6.820.6×4.5=10.2×5.01=17．列式计算：2.02×2.410.33﹣9.083.88+1.5418．用竖式计算．3.5×7= 8.1×16= 3.27×21= 5.63×36=4.32×7=64×0.07=19．用竖式计算．4.26×7.5= 3.15×1.4=47.5×0.6=5.25×0.24=7.38×2.5=14.24×0.35=8.5×16= 4.15×24=0.32×7= 6.4×9= 2.5×36=0.04×270= 1.25×3= 3.75×6=21．计算并验算．0.04×0.568.04×0.001 4.012×0.30.42×0.080.209×0.15 4.8×0.0015 87.5×2.410.28×0.731.4×3.80.82×2= 3.95×42= 2.073×15=0.78×24= 2.6×61=0.059×0.2= 4.268×1.7=57×5.7= 9.46×2.85=17.8×6.4= 1.5×4.9= 2.5×0.88=23．用竖式计算．1.24×0.8=0.85×1.2=7.05×2.4=12.3×2.4=60.5×400=89.3×7.6=24．竖式计算下面各题（得数保留两位小数）0.46×3.5=0.86×1.4=0.036×2.5=8.4×1.03=25．用竖式计算25﹣12.54= 1.59×2.4=2137÷29=26．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4= 0.3×0.3=0.35+0.75=0.48+1.62=10.1×78=27．用竖式计算．5.08×0.65=54.68﹣12.8=19.92+420.26 7.02×0.67=28．用竖式计算．4.8×2.5=5.07×0.29=0.32×1.7≈（得数保留一位小数）4.08×6.7≈（得数保留两位小数） 6.03×0.74≈（得数保留两位小数）29．竖式计算（第一、第二道的数保留两位小数）3.52×0.05≈120.44×0.2≈8.25×1.431．竖式计算0.38×0.25 150×0.12 0.87×1.91.28×2.3 2.07×0.24 0.17×1.0532．用竖式计算，前两题要验算．0.65×4.7= 2.06×9.4=0.072×8.5=9.9×0.99=33．列竖式计算．3.2×30= 1.25×4=4.2×15=11.5×108=0.27×0.36= 2.6×3.8=250×0.98= 6.05×1.6=34．列竖式计算．0.54×2.7 2.8×7.4 15.4×0.7 27.5×3.4．35．列竖式计算．27.6×0.45 8.08﹣2.68 5.546+29.380.023×1.8 17.04×0.26 8.35×3.5 5.08×0.25 1.18×3.436．列竖式计算．2.6×0.6 6.7×0.0715.6×1.3 0.81×2.7．37．用竖式计算：（得数保留一位小数）3.65×2.6 0.462÷2.80.627+3.3754.35﹣0.435．38．竖式计算31.5×24.5=0.8×0.56= 4.23×0.028= 0.63×1.05=36×0.56= 2.5×2.05=39．列竖式计算．（1）计算并验算．2.3×0.29= 2.7×1.02=（2）得数保留两位小数．0.45×0.96 6.53×0.75 3.27×0.28（3）得数保留一位小数．10.6×0.2622.45×0.4 6.28×3.240．列竖式计算下面各题并验算：0.34×2.5= 1.5×1.7=0.28×0.39= 4.2×2.4=41．用竖式计算．4.2×0.08= 1.5×6.2= 2.7×8.17= 3.28×6.5 2.9×0.56=（保留两位小数） 6.23×4.2=（保留一位小数）42．列竖式计算．3.4×0.25 6.5×2.4 0.035×0.6 1.25×0.02484×0.25=0.55×64=0.47×5.8= 6.06×0.32=0.075×0.07= 3.7×9.77=44．用竖式计算．5.08×0.65= 80.4×0.35= 19.92+420.26=45．列竖式计算3.2×1.8= 1.05×62= 2.7×0.11=0.12×0.18=0.15×0.12= 2.7×1200=7.6×0.82= 3.5×8.8= 3.25×0.31=0.93×2.02≈（结果精确到百分位） 5.9×3.14≈（结果保留一位小数）47．列竖式计算．1.2×1.36（结果保留两位小数）2.7×0.34（结果保留两位小数）0.74×5.8（结果保留两位小数） 2.6×3.5验算：0.25×0.12验算：48．用竖式计算35.7×5.06≈（得数保留一位小数） 6.928×3.2≈（得数保留两位小数）0.86×7= 3.3×16= 0.48×2.4= 1.7×0.45≈（保留两位小数）18.8×38.2= 48×0.952= 5.68×2.8=50．列竖式计算，带※的验算※0.38×0.25 1.07×2.1 （得数保留两位小数）7.4×2.84（得数保留一位小数） 1.08×9.5 0.75×1.02第三部分：小数除法口算1．直接写出下面各题的得数．4.8÷0.8=7.5﹣4.5=0.75÷15= 3.5×0.4= 10÷0.01=10﹣2.05=0.6×1.5=4÷0.25= 2．直接写出得数．2.1÷0.7=2÷5=1÷0.2=7÷8=0.1÷0.01=0.25×40= 6.5﹣5.6= 1.26÷0.6= 5.3÷0.53= 0.54÷6= 8.4÷0.7= 9.6÷8= 3．直接写得数30.2÷2=0.01÷0.5=0.72÷8= 4.8÷0.06= 6.4+3.6=1÷3=10﹣1.55= 1.25×8= 4．口算．0.9÷0.03=7.2﹣2=0.05×2=0.74×11= 0.25×4÷0.25×4= 3.1÷3.1= 1.32+8﹣1.32+8=7.2÷40= 5．直接写得数．6.3÷0.3= 1.8×0.5=25.1+4.9= 2.5×0.5×4= 6.25﹣0.87+0.13= 0.4×2.7×25= 3.8+5.6= 6.78-5.32= 6.直接写出得数．6.4÷0.2=0.9﹣0.89= 1.07+8.3= 3.6÷10= 100×1.5=8.1+9= 4.5×0.2=11﹣3.9=7．直接写得数．5.6÷0.8=6.82﹣5.2= 2.5×0.04=1﹣0.5+0.5= 9.15÷0.3=17.2÷0.86= 1.8÷0.1=12.5×0.8×0= 8．直接写得数1.4×100=2.80÷10= 2.4÷100=0.33×1000= 90÷6=0.025×100=90÷100=0.32+1.98= 9．直接写得数．10÷0.01=0.22+0.8=10﹣2.05=4÷0.25=0÷19.8=0.2×0.05= 1.36+3.64=0.4×0.25= 10．直接写得数0.25÷0.5=0.32÷0.04= 1.25×4= 14.3+5.7=1.6÷0.4=0.54÷6= 5.6÷7= 9×99+9= 11．直接写得数．5.09÷10=12.5×0.8=0.5÷0.25=45.6÷1=0.25×6=0.4×0.5=0.54÷0.9=10.2÷0.01= 12．口算4÷5= 1.8÷0.03=75÷2.5=0.2×25.4= 3.6+4.4=10﹣5.2= 3.4×0.2=7.8÷6= 13．直接写出得数3.6÷0.3= 6.3÷7= 5.6×100=0.25×4=0.56÷28=36÷0.9=0.64+0.8=0.72×3=1.2×20=7÷5= 6.12÷0.5=2.9÷5÷0.2=14．口算3.4÷2= 2.7÷0.3=0.42÷6=4.12×2= 6.3÷0.9= 1.53+2.4= 4.8×0.5= 6.4÷80=40×0.41=30.9×9=10×4.1= 4.6÷0.5= 15．直接写得数．0.25÷5=0.72÷0.9= 3.145×100=7.2÷3.6= 12.4÷4.1=0.01+0.99=7.6÷7.6= 1.25×4= 32.1×0.2= 12.5×0.8= 1÷50= 50﹣0÷2.5= 16．直接写得数0.35÷5=0.3×2=0.3÷0.2=0.7×0.9=0÷7÷3= 2.4×5= 4.9×0=2×0.45×5= 17．口算我最棒．0.64÷1.6= 1.4×0.5=0.72÷0.9=10.9﹣8.9= 2.7+7.2=0÷1.5= 2.7×0.3=24÷0.3= 4.3+2.7=200×0.07=0.25×4.9=4÷0.8= 18．直接写得数0.8÷10=25+8=187÷1000=0÷58=237﹣9=257+0=0×0.008=0.001×100= 19．直接写得数．0.63÷9= 5.4÷1.45=0×4.65= 3.5÷0.7= 1÷0.25=4×0.5=0.1÷0.05= 3.3÷0.1= 2.7÷0.90.36÷0.12=0.14÷2=9.6÷6=20．直接写得数．8.4÷4= 3.6÷0.2=0.8﹣0.35= 0.72÷90=1.1×0.8=0.56+4.44=0.3×0.2= 1.25×5×8=2.9+3.7+2.1=7.6×8+2.4×8= 5.8×3= 0.4×0.25= 21．请你直接写出得数4.8÷0.8=7.5﹣0.45=5.7+3.3=1÷0.25= 0.75÷1.5=0.2÷4=0.21×4= 1.2×60= 22．直接写出得数．0.72÷0.9=23.7+2.63= 4.8÷0.4=0.5÷2=6.5﹣5.6=1÷0.25=8÷0.8=10÷4=0.4×0.8=0.48÷0.8=0.35×4=0.3÷0.15= 23．直接写出得数1.2÷0.4=2÷8=4÷0.5=0.72÷4=0÷5.32= 3.6+1.8=1﹣0.73=0.24÷0.6= 6.4÷1.6=0.125×80=0.5×0.8=13.2÷0.6= 24．直接写得数．2.5÷0.5=0.42÷0.6=3.5÷0.01=0.54÷0.6= 0.25×4=12.5×0.8=0.2×50=0÷3.68= 25．直接写出得数．0.56÷0.7=0.6+0.65= 3.9÷1.3=12÷0.03=5.2÷0.13=99×1.01=13.5﹣2.8﹣7.2=25×0.32×125=6.2÷0.62﹣1= 5+3.2÷0.8= 8.62-4.68= 9.45+1055=26．口算3.6÷1.2=8.1÷9=4.8÷0.6= 1.25×8= 99÷0.9=25÷0.05=88÷0.008=1÷2.5= 27．直接写得数．0.64÷0.32= 0.7×1.2= 7.2÷（0.8×9）= 40×0.25= 2.9÷2.9= 0.3×0.6= 0.07×50= 100×0.07= 28．口算0.02×0.1= 12﹣4.3= 36÷0.01= 0÷4.8= 0.8×0.125= 2.3+0.8= 0.36÷0.4÷9= 22.1×1= 29．口算．3.6÷1.2=4.4÷4= 4.8÷0.4=1÷0.25=7.5÷0.5= 29.7÷0.9= 36.4÷0.7= 9.52÷1= 30．直接写得数．6.4÷8=9.8÷0.14= 4.8÷16=0.63÷9=8.7÷29=0.99÷9.9= 5.5÷0.11=13.8÷6.9= 31．直接写出得数．0.56÷8=0.07×10= 2.9×10.02≈3﹣1.9=1.2×0.1=51÷0.3=12.1÷3.9≈4.3+15.37= 32．直接写出得数．3.6÷3=7.8÷6=9.9÷9=56.7÷7=4.8÷4= 3.9÷13= 3.6÷12=8.1÷27= 0.04÷2=0.88÷4= 1.25÷5=7.5÷0.05=33．口算1÷0.25=0.78÷6=10÷8= 2.4÷24= 6.6÷0.6=5÷0.5= 4.5+0.76= 34÷0.2= 0.8×7=8×0.6=7.8÷0.6= 70×0.12= 34．直接算出得数．2.1÷2=3.8+1.02=7.5×0.4=2x﹣0.7x= 0.8×0.6= 3.2×0.5=9.6÷0.06= 3.57÷0.7= 35．直接写出得数．22.4÷4=0.25×4=0.21÷7= 5.6÷7=42÷3= 6.12÷0.6=0.54÷6=38.5÷5= 1.2×5= 24÷0.8= 0.72÷12= 0.12÷5= 36．直接写出得数．1.6÷0.4=7.2÷8= 4.2÷0.01=2﹣3.6÷1.8= 4÷5= 4.6÷0.46= 5.4÷1.8=0÷21.3= 37．口算1.2÷3=0.48÷6= 4.6÷23= 6.8÷4=0.72÷4=9.6÷6= 5.2÷13=12.5÷5= 38．直接写得数．56÷100= 1.29﹣0.29=0.56×100= 5.35+2.5=0.625×100=5﹣2.1=359+402=18.6﹣7=8.07×10= 3.5+0.9= 1.2+0.08=4×（25×14）= 7.34×0= 3.31+1.2=25×4÷25×4=0.25+0.2+0.75=39．口算0.42÷0.6=5×0.6= 2.4÷0.24= 1.25×2.3×8= 7.8+1.2=10÷0.1=0.1×0.1= 2.5﹣2.5×0.4= 40．直接写出得数．10﹣9.9=0.67+0.3=8.9×100= 2.5×4=8÷16=0.9×60= 1.04÷2=9.1÷7=1.5×8=0.39÷39=0.25÷8=0.05×300= 0.45÷9=7.2÷9=0×5.8=4×8×0.25= 41．口算．2.4÷2=48÷0.6=0.24÷0.2= 4.8÷6= 2.4÷0.2= 4.8÷0.6=9.6÷0.3=96÷3= 42．直接写出得数16÷5=22÷4=48÷100=12.6÷3=35÷70=95÷5= 1.3×4=12.6÷0.6= 43．直接写的数0.75÷0.5= 1.6÷0.4= 6.06÷6= 7÷3.5=16.8÷0.4= 2.8÷0.28= 1.8÷6= 0.5÷0.25= 44．口算下面各题．5.74÷10= 4.2÷0.07=0.56÷0.7= 0.16×4=0.4÷0.8= 1.2×5=0.6+0.65= 0.64÷2=45．计算．12.8÷4=31.5÷5= 5.1÷1.7= 39.6÷4= 97.8÷6=11.7÷3= 2.5×4÷2.5×4= 29.4÷2= 83.5÷5=95.2÷4=7.2÷0.9= 67.8÷2= 46．口算：0.96÷8=0.08÷0.01=0.2÷0.05=0.36÷0.18= 0.54÷0.6= 4.8÷0.24=10﹣0.92=0.9÷45= 47．直接写出得数．2.5×4=10÷0.1= 2.8÷0.4= 4.5÷0.15=1.5×6=15÷0.5=5÷2= 1.2÷0.03= 48．直接写出得数．0.3+5.7=1﹣0.6= 3.3+5.6=0.25+5.75= 5.3+50.7=0.4﹣0.35=1﹣0.04=8+50.28=0.9﹣0.7=10﹣9.9=8.6×100=148.3÷100= 49．直接写出得数．3.6÷1.2=0.72÷0.9= 2.6÷13=4.8÷0.4=4.4÷4=0.78÷6=7.2÷0.4=1÷0.25=7.1×0.4= 4.5÷0.15=1﹣0.07=0.42÷0.7= 50．直接写得数0.29÷100=5÷1000=19+0÷19=423﹣（100+23）= 170×100=320÷100=90﹣26﹣13=0.56×100÷1000= 0.26×1000=24×99+24=38﹣25+12﹣25=500÷100×1000=第四部分：小数除法列竖式计算1．竖式计算．0.51÷0.5=98÷5.6=20.4÷1.7=验算：2．用竖式计算（★需验算，除不尽的保留两位小数）．1.092÷0.42=★210÷1.4=8.9÷0.56≈3．列竖式计算．69.02÷3.4 26.8×0.35 46.8÷3.4（保留一位小数）4.2÷0.28 4.2÷1.32（得数保留三位小数）2.05÷25 35.2÷16 0.13÷0.17（商精确到百分位）5．用竖式计算．117.3÷0.46 24×0.37 40.32÷l.68．6．竖式计算2.1÷0.7= 7÷0.35=7.2÷4=7．用竖式计算并验算．2.76×24=12.6÷0.28=220.5÷15=（用乘法验算） 2.64×1.09=（得数保留两位小数）6.3÷0.125=0.84×1.65=9．列竖式计算．（后1题得数保留两位小数）33.6÷568.96÷0.287.12÷0.2210．竖式计算．12.4÷4=45.9÷0.6=51÷0.3=52.8÷12=75.6÷0.18=9.6÷0.32=13÷2.554.5÷0.160.68÷0.95（保留两位小数）2.05×0.16（验算）78.6÷11=（商用循环小数表示） 6.21÷0.03．12．竖式计算，带*的要验算．1.25÷0.25=78.6÷11=（商用循环小数示）5.63÷7.8≈数保留两位小数）28.28÷0.4=*0.303÷5=13．列竖式计算（带★的保留两位小数）★1.57÷3.9 ★0.58×0.24 70.7÷33（商用循环小数表示）14．竖式计算（得数保留1位小数）带★的验算★64.8÷1.8≈★8﹣6.69≈0.65×3.84≈15．竖式计算．（带*的要验算）9.4÷11=*144÷12=14.2÷11=16．竖式计算．75.6÷0.1825.6÷0.032 2.78×1.817．竖式计算，按要求保留商的近似值．30÷7 （保留两位小数）60.9÷3.2（保留一位小数）25÷9.9（保留整数）5.63÷6.1（得数保留两位小数）10÷3.3（用循环小数表示）18．用竖式计算6.21÷0.03= 10.8÷45=8.54÷0.7= 72.9÷0.9=19．竖式计算．（后两题验算）50.96÷6.5 9.25÷3.7= 15÷74 6.72÷4.2=20．用竖式计算1.25÷0.25= 8.4÷0.56= 29.27÷3.28.54÷0.7=（验算）78.6÷11=（商用循环小数表示）21．用竖式计算．4.5×0.18= 2.346÷2.3=验算：70.3×3.6=5.06÷2.2=22．用竖式计算（带*得数保留两位小数）2.6×0.25 29.9÷0.46*4.65÷1.3．23．列竖式计算（除不尽的保留两位小数）24.6÷0.16；13.9÷6；0.325÷1.5；6.24÷0.8；18.3÷4；19.2÷6．24．用竖式计算，并指出哪些是循环小数．7.05÷0.94 1.8÷0.25 1.71÷3.8 4.83÷0.7 3.7÷2.2 5.7÷925．用竖式计算3.9÷0.26≈9.35÷3.4≈（得数保留一位小数）0.17÷0.11≈（商用循环小数表示）0.168÷0.7≈4.05÷18≈（得数保留两位小数） 4.68÷5.4=（商用循环小数表示）26．用竖式计算21.45÷15；49.04÷8；217.6÷34；11.7÷36； 1.69÷26；54.81÷27．27．将下列式子的得数保留两位小数25.32÷0.15 1.03÷1.2 1.07÷9.29.45÷0.32 13.51÷0.13 17.96÷0.36．28．列竖式计算．（第三小题得数保留两位小数，第五小题请写出验算过程．）47.04÷5.6= 3.28×2.7=0.764×1.2≈52.92÷0.27=8÷1.28=15.36÷12=29．列竖式计算：0.195÷0.13 3.6÷0.8 76.76÷0.766÷2.4 7.085÷0.65 9.72÷0.27．30．竖式计算．0.38×0.23 5.79×3.6 4.6×0.25 52.95÷75 3.01÷7 4.95÷1131．计算下面各题，并用乘法验算15.6÷12 328÷16 1.35÷2784.01÷31 0.646÷19 4.7×0.59．32．用竖式计算下列各题．（除不尽的保留两位小数，后面两道题要验算）45.15÷1.5= 52.65÷1.3= 15.75÷2.1= 8.42+0.6=0.436÷0.2=9.25÷3.7=6.6÷443.5÷2918.9÷27 1.35÷1537.5÷628.6÷1120.4÷24 3.64÷5234．竖式计算0.448÷32=14.3+6.7= 3.8×0.26=11.32﹣8.95=35．用竖式计算1.26÷1.8=64×5.04=43.5÷0.29=验算5.02×4.8= 1.35×320=26÷0.13=48÷2.3≈（保留两位小数）37．用竖式计算，加★号的要验算．★0.756÷0.18=0.35×0.48= ★6.02﹣5.94=38．用竖式计算（有★的要验算）96.6÷42 7.79÷95★6.3÷0.427÷0.35 0.14÷0.08 42÷8．7.8÷75= 2.55÷2.5= 2.5×1.04=5.63÷6.1（得数保留两位小数）27.8÷2.5=验算9.8×0.75=40．列竖式计算3.5×10.880.93÷26.7（精确十分位） 1.42÷1.1 （商用循环小数表示）41．竖式计算30.6÷45 4.06÷0.58※54.6÷0.91．42．计算下面各题，除不尽的用循环小数表示商43.8÷12 0.12÷0.25 7÷0.35 11.62÷913÷11 30.1÷33 19÷12 5.6÷0.07．43．列竖式计算．0.58×0.08=（结果保留两位小数）0.54÷0.018=13.6÷3=（商用循环小数表示）44．列竖式计算，并验算前两个，第三个保留两位小数．95.2÷28=46.8÷0.13= 5.63÷7.8=。

小数乘法口算练习题
1. 计算下列各题，并写出结果：
- 0.5 × 0.3
- 0.8 × 0.4
- 1.2 × 0.5
- 0.6 × 0.7
- 0.9 × 0.1
2. 完成以下小数乘法，并简化结果：
- 2.4 × 0.15
- 3.6 × 0.25
- 0.75 × 0.2
- 5.08 × 0.05
- 0.4 × 0.65
3. 用小数表示下列乘法结果：
- 3/4 × 2/5
- 7/8 × 3/10
- 5/6 × 4/9
- 9/10 × 7/8
- 2/3 × 5/6
4. 计算下列小数乘法题，并写出答案：
- 0.45 × 0.2
- 0.36 × 0.5
- 0.78 × 0.25
- 0.9 × 0.08
- 1.5 × 0.3
5. 用小数乘法解决下列问题：
- 如果每千克苹果的价格是2.5元，那么1.8千克苹果的总价是多少？
- 一件衣服的原价是120元，现在打8折，那么打折后的价格是多少？
- 一个长方形的长是4.2米，宽是2.5米，求它的面积。

- 一个班级有45名学生，每人需要交5.5元的书本费，总共需要多少钱？
- 一个工厂每天生产3.6吨产品，那么一周（7天）的总产量是多少吨？。

五年级小数乘法口算题
题目：
1. 公式
解析：先算公式，因数中一共有一位小数，所以公式
2. 公式
解析：先算公式，因数中一共有一位小数，所以公式3. 公式
解析：先算公式，因数中一共有一位小数，所以公式4. 公式
解析：先算公式，因数中一共有一位小数，所以公式
5. 公式
解析：先算公式，因数中一共有一位小数，所以公式
解析：先算公式，因数中一共有一位小数，所以公式
7. 公式
解析：先算公式，因数中一共有一位小数，所以公式
8. 公式
解析：先算公式，因数中一共有一位小数，所以公式
9. 公式
解析：先算公式，因数中一共有一位小数，所以公式10. 公式
解析：先算公式，因数中一共有一位小数，所以公式
11. 公式
解析：先算公式，因数中一共有一位小数，所以公式
解析：先算公式，因数中一共有一位小数，所以公式
13. 公式
解析：先算公式，因数中一共有一位小数，所以公式
14. 公式
解析：先算公式，因数中一共有一位小数，所以公式
15. 公式
解析：先算公式，因数中一共有一位小数，所以公式16. 公式
解析：先算公式，因数中一共有一位小数，所以公式
17. 公式
解析：先算公式，因数中一共有一位小数，所以公式
解析：先算公式，因数中一共有一位小数，所以公式
19. 公式
解析：先算公式，因数中一共有一位小数，所以公式
20. 公式
解析：先算公式，因数中一共有一位小数，所以公式。

小数乘法口算500道+竖式300道第一部分口算500道一．计算题（共50小题）1.直接写得数．0.5×1.4=80×0.125= 2.5×0.4=0.036×100=0.24×5=0.12×0.5=35÷1000= 2.2×0.5=0.12×5=0.04×0.1= 3.5+0.15=8﹣6.9=2．口算．0.4×5 1.2×44×1.51×0.50.01×0.1 1.25×0.40.36×0.20.8×03．直接写出得数．0.12×6= 1.25×0.4=30×0.8=12.5×0.8= 3.73﹣0.8﹣1.73= 3.26×0= 3.25+0.74= 5.2﹣2.64=0.24×5=4×0.05×2=3.9+7.1= 6.2×0.5=0.25×0.4=0.036×100= 3.64+6.36+5.5= 4．直接写出得数．0.4×0.02= 1.8×0.4=6×0.25= 1.25×0.8=3﹣0.98=0.9÷0.01= 3.9×0.01=99×0.25= 5．直接写得数：0.5×3=0.45+0.4=4×0.25=10.2+11.3= 0.09×100=8.7﹣0.5=0.96﹣0.7=12.9﹣2.9= 3.69×0=38.7÷10=6．直接写得数：0.2×3=0.45+0.4=4×0.25=18.7+11.3=0.09×100=8.7﹣0.5=0.96﹣0.7=18﹣1.67=1×8.79= 3.69×0=38.7÷10=2÷100=7．直接写出得数．0.28×10=0.9×5=8×0.06=0.05×1.6= 100×0.7= 2.5×8= 1.06×7=12.5×0= 1.7+3.3×0.2=0.2×0.2×0.2=8．直接写得数：0.2×36=0.45×2=4×0.25= 3.8÷100=0.09×1000=1﹣0.9=0.96﹣0.7= 2.5×7.4×4= 9．口算0.2×0.4=8.2+1.8= 6.45×0.01= 2.5×0.4=0.8×50= 2.4×5=0.9﹣0.52=10.2×4.5= 10．直接写出得数．0.7×0.9=0.14×0.3= 1.7×0.03=0.12×6=5.5×10= 2.6×0.5= 1.8×0.04= 2.6×2﹣0.5= 11．直接写出得数．5×1.8=0.8×1.5=0.65+0.35=9.8+1.2=0.25×4=1﹣0.63=10.75﹣0.5= 1.25×80=1.7×0.9= 4.6×0.5= 1.42×100=19.8﹣8= 12．直接写出得数．0.25×4= 1.25×8=8.2×6.9×0=0.2×18=6.29×100=0.02×500= 3.4×2=0.26×0.5= 13．直接写得数0.2×4=0.8×25=0.57+0.43= 2.8×10=18.4÷100= 2.5×0.4= 4.7﹣1.78=0.125×8=1.8×0.5=0.035×1000=14．口算0.4×20= 1.3×3=0.25×50=0.9×300 2.4×50=0.125×200=600×0.4=800×0.25=1500×0.2=15．列竖式计算．2.3×0.8= 6.9×3.1=9.87×1.8=24.5×6.820.6×4.5=10.2×5.01=16．直接写得数．3.14×7=52=6π=62﹣20=402﹣302=b×b= 3.14×302= 3.14×42= 1.25×32=b+b=17．直接写得数．0.16×5= 4.2×0.3=25×0.4=2×0.45=0.5×0.07=0.3×0.7×10=18．口算题．0.1×208= 2.8×2=3×0.18=0.2×600= 1.3×5=8×0.05= 1.3×50= 80×0.05=7.26×1=0.4×22=0.15×40=0.7×1.4=1.25×10= 4.5×0.02=0.03×8=0×1.001=0.8×12.5=0.4×0.7= 1.3×4= 1.35×10= 1.4×0.4=1.4×5= 1.45×100=3.5×40=0.02×38=25×0.4= 1.6×1.5=0.01×10= 250×0.04=1.5×0.02=0.05×12=200×0.05=2.5×0.4=0.05×430=20×0.5= 250×0.4=7.682×0=2×0.005= 2.05×2=19．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4=0.3×0.3=0.35+0.75=0.48+1.62=10.1×78=20．直接写出得数．0.2×8= 6.2+0.04= 2.5×0.4=0.6×0.7=18.5+71.5= 6.4+4.6=0.04×0.3= 2.1﹣2.01= 1.41×1000=21．直接写出得数45+426=58.7﹣38.5= 2.25×8= 2.7×0.8= 6.4×0.8=320×0.03=11.004×50= 4.8×9.8= 22．口算．2.4×0.3=0.25×4=0.06×0.8=8.5×0.2= 1.25×0.8=7.5×0.5=6×4.4=0.13×0.05=19×0.7=23．口算：0.9×0.3= 3.5×0.2= 2.1×0= 6.6×10=0.3×7= 0.27×3=3×9.6=0.8×1.5=7.2×0.6= 2.5×0.4= 24．口算0.37×10=0.37×100=0.37×1000= 2.5×4= 0.25×4= 4.8×2=0.12×0.3=2×5.8= 0.28×3=0.16×4= 3.5×2=5×1.2= 5×1.5=3×0.25= 3.5×0.2= 3.5×5= 5×0.25=0.3×0.2= 3.5×0.5=3×1.5= 25．直接写得数．0.5×6=0.125×8= 2.5×0.4= 3.1×0.3=4×0.25= 1.25×6=0.2×0.05=0.8×0.05= 1.7×0.3= 1.25×200=40×0.05=0.04×2=26．口算．0.2×50= 2.4×0.5=0.25×4= 3.2×0.3=12.5×80=0.17×10= 4.5+3.85= 2.5×0.7×0.4=3.5×8= 1.2×0.6= 5.2﹣2.8= 3.7+5.8=27．直接写得数．0.5×0.7= 2.1×0.4= 3.4×0.2=0.06×1.2=0.63×2=0.05×0.06=0.8×0.4=7.85×0.01= 0.15×0.4= 1.3×30=0.25×0.6= 3.125×100= 28．直接写出得数．12.5×8= 2.5×0.4= 6.4+4.6=0.04×0.3=0.5×2.4=0.2×2.5= 5.18+3.02= 1.41×1000=29．口算：0.3×4= 2.3×0.2= 3.6+6.4=0.6×0.7=1.6×0.4=0.9×0.08=0.25×4=12.5×8= 0.7×0.9=0.04×0.2=0.8×0.05=3.1×0.3= 0.16×0.5= 1.7×0.03= 1.8×0.04=0.12×6= 30．直接写得数0.8×25=0×4.23=0.57+0.43=0.02×500=12.5×8=50×0.04=80×0.3= 1.1×9=31．直接写得数．0.7×10 3.02×100 3.6×2 4×1.52.5×4 12.5×0.8 4.5+2.6 7﹣1.66.4﹣2.3 10+6.01 8.3﹣1.37.3+2.7 32．口算9.5×0.2= 3.2×0.5=0.8×2.5= 4.4×0.4=35×0.4=33．口算．0.8×7=0.9×0.3= 1.32×8=10.3×2=3.5×0.2=10×0.05=0.13×7=0.05×4=30×0.1=12.5×8= 3.25×0=0.4×50= 34．直接写出得数：2.5×4= 2.4×0.5=8×0.125=0.27×3=7﹣6.38=0.22×0.5=35．直接写出得数．（后两题得数保留一位小数）0.7×0.9=0.14×0.3= 1.7×0.03= 1.8×0.04≈0.12×6= 5.5×10= 2.6×0.5= 2.6×0.08≈36．直接写出得数0.45×0.2= 4.38+3.5=0.9×7=（3.85+5.45）×0=0.75×1= 2.5×4= 5.4×20=7.5×0.4=37．口算．2.3×2=10×0.2= 1.45×10= 4.3×10═ 2.4×5=4.5×0.9= 2.5×8= 3.9×3=5×0.01=5.98×1000= 38．直接写得数：2.5×33.06×2 0.25×44.2×105.3×100 2.5×62.2×4 1.6×4 1.25×839．口算．1.5×8=2.4×5= 1.25×8=3.58×2=0.5×0.9=40．直接写得数0.7×0.9=0.12×50=60×0.5= 1.8×0.04=1.25×8=24×0.05=0.15×0.4=0.9×1.5=3.4×0.7=0.78×0.2=30×0.5=0.8×0.9=41．口算．0.5×0.2=50×0.2=500×0.2= 2.4×4= 2.5×0.4= 0.25×40=0.125×8=12.5×8= 1.25×80=0.24×5= 42．口算：0.5×2=0.25×4=12.5×8=0.125×8=7÷0.7=1﹣0.125×8= 1.25×32=0.25×56=43．直接写出得数．0.4×0.3= 2.5×0.6=8.8×0.1= 1.3×0.2=5.28+1.6=10﹣1.7﹣2.3=6.09×0=100×0.7=44．直接写出得数0.5×0.2=0.25×0.4= 1.25×8=0×1000+3=0.5÷100=0.12×40=100×0.78=12.78+0.22=0.6+0+0.7=0.72+1000=45．直接写得数．0.5×0.2=4×0.15=50×0.4=8×0.125=0.23×10=0.12×7=46．直接写出得数．0.7×0.9= 2.6×0.5=0.14×0.3= 5.5×10=1.7×0.03= 1.8×0.04=0.12×6= 4.8×5= 47．口算0.2×0.4=8.2+1.8=100﹣35.22= 2.5×0.4=0.8×50=8×0.24= 3.9×1.3= 2.4×5=0.9﹣0.52=0×3.52=12.5×8= 2.4×0.01= 48．直接写得数0.8×0.6= 5.5×3=0.5×0.6=0.125×0.8=9.6×0.1= 0.07×0.9=12.4×0.2= 2.4×5=14×0.01= 1.5×2= 49．口算．0.37×100=0.25×4=0.3×0.2=70×0.12=18×0.3=0.5×0.6= 3.7×0.2=5×1.2=第二部分竖式300道一．计算题（共50小题）1．列竖式计算．75﹣8.49= 3.72×1.25= 5.04×26=5.94+12.7=0.95×6.7=35.62﹣13.4=2．竖式计算0.64×18=25.8×102=40.7×0.25=13.45×2.6=（保留整数） 4.865×8≈（保留整数）10.23×42≈（保留一位小数）3．竖式计算（前面有*要验算）．2.18×3.6*4.23×0.8620.07×1.0250.6×0.90.57×0.86*0.8×0.314．用竖式计算．8×0.12=（验算） 1.9×3.5=（验算）0.401×0.3=0.45×0.96=0.17×0.71=5．竖式计算4.57×1.8 0.125×0.8 3.75×0.249.37×8.52.07×3.6 3.35×1.6．6．列竖式计算：1.8×0.36=35.37+28.63=19.9﹣8.75=1.06×0.48=18.9+28.65=22.87﹣18.65=7．竖式计算7.6×0.82= 3.25×0.31=7.5×0.59=（验算）8．列竖式计算，带*号的要验算．25.78+3.12=13.8×9=*8﹣2.67=*5.73+6.7=9．列竖式计算4.8×17 1.88×25 2.4×0.370.89×5.3．10．列竖式计算．3.8×0.15=4.6×50=8.7×2.04= 13.2×9.8=0.86×0.72=5﹣1.08=11．列竖式计算．（得数保留两位小数）2.375×105 5.16×4.3 0.45×0.206．12．用竖式计算．4.8×0.259.3×1.39.8×0.5 2.1×2.15．13．列竖式计算．0.04×0.12 4.25×8.8 3.84×0.25．14．用竖式计算．62.4+7.62= 6.07﹣4.993=8.7×1.4= 1.28×3.5=15．列竖式计算8×0.125 4.23×536.5×425×0.12618×1.833.42×2016．列竖式计算．2.3×0.8= 6.9×3.1=9.87×1.8=24.5×6.820.6×4.5=10.2×5.01=17．列式计算：2.02×2.410.33﹣9.083.88+1.5418．用竖式计算．3.5×7=8.1×16= 3.27×21=5.63×36= 4.32×7=64×0.07=19．用竖式计算．4.26×7.5= 3.15×1.4=47.5×0.6=5.25×0.24=7.38×2.5=14.24×0.35=1.21×8=2.4×0.2=0.57×0.43=20．列竖式计算．8.5×16= 4.15×24=0.32×7= 6.4×9= 2.5×36=0.04×270= 1.25×3= 3.75×6= 21．计算并验算．0.04×0.568.04×0.001 4.012×0.30.42×0.080.209×0.15 4.8×0.0015 87.5×2.410.28×0.731.4×3.822．列竖式计算0.82×2= 3.95×42= 2.073×15=0.78×24= 2.6×61=0.059×0.2= 4.268×1.7=57×5.7= 9.46×2.85=17.8×6.4= 1.5×4.9= 2.5×0.88=23．用竖式计算．1.24×0.8=0.85×1.2=7.05×2.4=12.3×2.4=60.5×400=89.3×7.6=24．竖式计算下面各题（得数保留两位小数）0.46×3.5=0.86×1.4=0.036×2.5=8.4×1.03=25．用竖式计算25﹣12.54= 1.59×2.4=2137÷29=26．直接写出得数．1.5×0.2= 1.25×0.8= 4.5×0.4=2.5×7×0.4= 0.3×0.3=0.35+0.75=0.48+1.62=10.1×78= 27．用竖式计算．5.08×0.65=54.68﹣12.8=19.92+420.26 7.02×0.67=28．用竖式计算．4.8×2.5=5.07×0.29=0.32×1.7≈（得数保留一位小数）4.08×6.7≈（得数保留两位小数） 6.03×0.74≈（得数保留两位小数）29．竖式计算（第一、第二道的数保留两位小数）3.52×0.05≈120.44×0.2≈8.25×1.48.76×3.5 4.25×0.4 2.7×1.631．竖式计算0.38×0.25 150×0.12 0.87×1.91.28×2.3 2.07×0.24 0.17×1.0532．用竖式计算，前两题要验算．0.65×4.7= 2.06×9.4=0.072×8.5=9.9×0.99= 2.04×0.8=33．列竖式计算．3.2×30= 1.25×4=4.2×15=11.5×108=0.28×4.5= 0.27×0.36= 2.6×3.8=250×0.98= 6.05×1.6=10.8×2.07=34．列竖式计算．0.54×2.7 2.8×7.4 15.4×0.7 27.5×3.4．27.6×0.45 8.08﹣2.68 5.546+29.380.023×1.817.04×0.26 8.35×3.5 5.08×0.25 1.18×3.436．列竖式计算．2.6×0.6 6.7×0.0715.6×1.3 0.81×2.7．37．用竖式计算：（得数保留一位小数）3.65×2.6 0.462÷2.80.627+3.3754.35﹣0.435．38．竖式计算31.5×24.5=0.8×0.56= 4.23×0.028=0.63×1.05=36×0.56= 2.5×2.05=（1）计算并验算．2.3×0.29= 2.7×1.02=（2）得数保留两位小数．0.45×0.96 6.53×0.75（3）得数保留一位小数．10.6×0.2622.45×0.4．40．列竖式计算下面各题并验算：0.34×2.5= 1.5×1.7=0.28×0.39= 4.2×2.4=41．用竖式计算．4.2×0.08= 1.5×6.2= 2.7×8.17=2.9×0.56=（保留两位小数） 6.23×4.2=（保留一位小数）42．列竖式计算．3.4×0.25 6.5×2.4 0.035×0.6 1.25×0.024．43．用竖式计算．84×0.25=0.55×64=0.47×5.8=6.06×0.32=0.075×0.07= 3.7×9.77=44．用竖式计算．5.08×0.65= 54.68﹣12.8= 80.4×0.35= 19.92+420.26=45．列竖式计算3.2×1.8= 1.05×62= 2.7×0.11=0.12×0.18=0.15×0.12= 2.7×1200=46．列竖式计算．7.6×0.82= 3.5×8.8= 3.25×0.31=0.93×2.02≈（结果精确到百分位） 5.9×3.14≈（结果保留一位小数）47．列竖式计算．1.2×1.36（结果保留两位小数）2.7×0.34（结果保留两位小数）0.74×5.8（结果保留两位小数） 2.6×3.5验算：0.25×0.12验算：48．用竖式计算18.8×38.2= 48×0.952=35.7×5.06≈（得数保留一位小数） 6.928×3.2≈（得数保留两位小数）49．用竖式计算．0.86×7= 3.3×16= 0.48×2.4= 1.7×0.45≈（保留两位小数）50．列竖式计算，带※的验算※0.38×0.25 1.07×2.1 （得数保留两位小数）7.4×2.84（得数保留一位小数） 1.08×9.5 0.75×1.02．第一部分口算500道参考答案与试题解析一．计算题（共50小题）1.【解答】解：0.5×1.4=0.780×0.125=10 2.5×0.4=10.036×100=3.60.24×5=1.20.12×0.5=0.0635÷1000=0.0352.2×0.5=1.10.12×5=0.60.04×0.1=0.0043.5+0.15=3.658﹣6.9=1.12．【解答】解：0.4×5=2 1.2×4=4.84×1.5=61×0.5=0.50.01×0.1=0.0011.25×0.4=0.50.36×0.2=0.0720.8×0=03．【解答】解：0.12×6=0.721.25×0.4=0.530×0.8=2412.5×0.8=10 3.73﹣0.8﹣1.73=1.2 3.26×0=0 3.25+0.74=3.995.2﹣2.64=2.560.24×5=1.24×0.05×2=0.43.9+7.1=11 6.2×0.5=3.10.25×0.4=0.10.036×100=3.63.64+6.36+5.5=15.5 4．【解答】解：0.4×0.02=0.0081.8×0.4=0.726×0.25=1.5 1.25×0.8=13﹣0.98=2.020.9÷0.01=903.9×0.01=0.03999×0.25=24.755．【解答】解：0.5×3=1.50.45+0.4=0.854×0.25=110.2+11.3=21.50.09×100=98.7﹣0.5=8.20.96﹣0.7=0.2612.9﹣2.9=103.69×0=038.7÷10=3.876．【解答】解：0.2×3=0.60.45+0.4=0.854×0.25=118.7+11.3=300.09×100=98.7﹣0.5=8.20.96﹣0.7=0.2618﹣1.67=16.331×8.79=8.793.69×0=038.7÷10=3.872÷100=0.027．【解答】解：0.28×10=2.80.9×5=4.58×0.06=0.480.05×1.6=0.08100×0.7=70 2.5×8=20 1.06×7=7.4212.5×0=01.7+3.3×0.2=2.360.2×0.2×0.2=0.0088．【解答】解：0.2×36=7.20.45×2=0.94×0.25=1 3.8÷100=0.0380.09×1000=901﹣0.9=0.10.96﹣0.7=0.262.5×7.4×4=749．【解答】解：0.2×0.4=0.088.2+1.8=106.45×0.01=0.06452.5×0.4=10.8×50=40 2.4×5=120.9﹣0.52=0.2810.2×4.5=45.910．【解答】解：0.7×0.9=0.630.14×0.3=0.0421.7×0.03=0.0510.12×6=0.725.5×10=55 2.6×0.5=1.3 1.8×0.04=0.0722.6×2﹣0.5=4.711．【解答】解：5×1.8=90.8×1.5=1.20.65+0.35=19.8+1.2=110.25×4=11﹣0.63=0.3710.75﹣0.5=10.251.25×80=1001.7×0.9=1.534.6×0.5=2.31.42×100=14219.8﹣8=11.812．【解答】解：0.25×4=1 1.25×8=108.2×6.9×0=00.2×18=3.66.29×100=6290.02×500=103.4×2=6.80.26×0.5=0.1313．【解答】解：0.2×4=0.80.8×25=200.57+0.43=1 2.8×10=2818.4÷100=0.1842.5×0.4=1 4.7﹣1.78=2.920.125×8=11.8×0.5=0.90.035×1000=3514．【解答】解：0.4×20=8 1.3×3=3.90.25×50=12.50.9×300=2702.4×50=1200.125×200=25600×0.4=240800×0.25=2001500×0.2=30015．【解答】解：2.3×0.8=1.84 6.9×3.1=21.399.87×1.8=17.76624.5×6.8=166.620.6×4.5=92.710.2×5.01=51.10216．【解答】解：3.14×7=21.9852=256π=18.8462﹣20=16402﹣302=700b×b=b2 3.14×302=28263.14×42=50.241.25×32=40b+b=2b17．【解答】解：0.16×5=0.84.2×0.3=1.2625×0.4=102×0.45=0.90.5×0.07=0.0350.3×0.7×10=2.118．【解答】解：0.1×208=20.82.8×2=5.63×0.18=0.540.2×600=1201.3×5=6.58×0.05=0.41.3×50=6580×0.05=47.26×1=7.260.4×22=8.80.15×40=0.60.7×1.4=0.981.25×10=12.54.5×0.02=0.090.03×8=0.240×1.001=00.8×12.5=100.4×0.7=0.281.3×4=4.21.35×10=13.51.4×0.4=0561.4×5=7 1.45×100=1453.5×40=1400.02×38=0.7625×0.4=101.6×1.5=2.40.01×10=0.1250×0.04=101.5×0.02=0.030.05×12=0.6200×0.05=102.5×0.4=10.05×430=21.520×0.5=10250×0.4=1007.682×0=02×0.005=0.012.05×2=4.119．【解答】解：1.5×0.2=0.3 1.25×0.8=1 4.5×0.4=1.82.5×7×0.4=7 0.3×0.3=0.090.35+0.75=1.10.48+1.62=2.110.1×78=787.8 20．【解答】解：0.2×8=1.6 6.2+0.04=6.24 2.5×0.4=10.6×0.7=0.4218.5+71.5=90 6.4+4.6=110.04×0.3=0.0122.1﹣2.01=0.091.41×1000=141021．【解答】解：45+426=47158.7﹣38.5=20.22.25×8=18 2.7×0.8=2.16 6.4×0.8=5.12320×0.03=9.611.004×50=550.24.8×9.8=47.04 22．【解答】解：2.4×0.3=0.720.25×4=10.06×0.8=0.0488.5×0.2=1.7 1.25×0.8=17.5×0.5=3.756×4.4=26.40.13×0.05=0.006519×0.7=13.323．【解答】解：0.9×0.3=0.273.5×0.2=0.72.1×0=0 6.6×10=660.3×7=2.1 0.27×3=0.813×9.6=28.80.8×1.5=1.27.2×0.6=4.322.5×0.4=1 24．【解答】解：0.37×10=3.70.37×100=370.37×1000=3702.5×4=100.25×4=1 4.8×2=9.60.12×0.3=0.0362×5.8=11.60.28×3=0.840.16×4=0.643.5×2=75×1.2=65×1.5=7.53×0.25=0.753.5×0.2=0.7 3.5×5=17.55×0.25=1.250.3×0.2=0.063.5×0.5=1.753×1.5=4.5 25．【解答】0.5×6=30.125×8=1 2.5×0.4=1 3.1×0.3=0.934×0.25=1 1.25×6=7.50.2×0.05=0.010.8×0.05=0.041.7×0.3=0.511.25×200=25040×0.05=20.04×2=0.08 26．【解答】解：0.2×50=10 2.4×0.5=1.20.25×4=1 3.2×0.3=0.9612.5×80=10000.17×10=1.74.5+3.85=8.352.5×0.7×0.4=0.7 3.5×8=28 1.2×0.6=0.725.2﹣2.8=2.4 3.7+5.8=9.527．【解答】解：0.5×0.7=0.35 2.1×0.4=0.84 3.4×0.2=0.680.06×1.2=0.072 0.63×2=1.260.05×0.06=0.0030.8×0.4=0.327.85×0.01=0.0785 0.15×0.4=0.061.3×30=390.25×0.6=0.153.125×100=312.5 28．【解答】解：直接写出得数：12.5×8=1002.5×0.4=1 6.4+4.6=110.04×0.3=0.0120.5×2.4=1.20.2×2.5=0.055.18+3.02=8.21.41×1000=1410 29．【解答】0.3×4=1.2 2.3×0.2=0.46 3.6+6.4=100.6×0.7=0.421.6×0.4=0.640.9×0.08=0.0720.25×4=112.5×8=1000.7×0.9=0.630.04×0.2=0.0080.8×0.05=0.04 3.1×0.3=0.930.16×0.5=0.081.7×0.03=0.0511.8×0.04=0.0720.12×6=0.72 30．【解答】解：0.8×25=200×4.23=00.57+0.43=10.02×500=1012.5×8=10050×0.04=280×0.3=241.1×9=9.931．【解答】解：0.7×10=7 3.02×100=302 3.6×2=7.2 4×1.5=62.5×4=10 12.5×0.8=10 4.5+2.6=7.1 7﹣1.6=5.46.4﹣2.3=4.1 10+6.01=16.01 8.3﹣1.3=77.3+2.7=1032．【解答】解：9.5×0.2=1.93.2×0.5=1.60.8×2.5=24.4×0.4=1.7635×0.4=14 4.8×50=2404.8×0.25=1.28.8×5=441.4×0.5=0.712.5×4=50 33．【解答】解：0.8×7=5.60.9×0.3=0.271.32×8=10.5610.3×2=20.63.5×0.2=0.710×0.05=0.50.13×7=0.910.05×4=0.230×0.1=312.5×8=100 3.25×0=00.4×50=2034．【解答】解：2.5×4=10 2.4×0.5=1.28×0.125=10.27×3=0.817﹣6.38=0.620.22×0.5=0.1135．【解答】解：0.7×0.9=0.630.14×0.3=0.0421.7×0.03=0.0511.8×0.04≈0.10.12×6=0.725.5×10=55 2.6×0.5=1.3 2.6×0.08≈0.2 36．【解答】解：0.45×0.2=0.094.38+3.5=7.880.9×7=6.3（3.85+5.45）×0=00.75×1=0.75 2.5×4=10 5.4×20=1087.5×0.4=337．【解答】解：2.3×2=4.610×0.2=21.45×10=14.54.3×10═432.4×5=124.5×0.9=4.052.5×8=203.9×3=11.75×0.01=0.055.98×1000=5980 38．【解答】解：2.5×3=7.53.06×2=6.12 0.25×4=14.2×10=425.3×100=5302.5×6=152.2×4=8.8 1.6×4=6.4 1.25×8=1039．【解答】解：1.5×8=122.4×5=12 1.25×8=103.58×2=7.16 0.5×0.9=0.451.2×6=7.2 0.2×0.9=0.18 0.72×5=3.6 0.37×4=1.48 0.25×0.4=0.1 40．【解答】解：0.7×0.9=0.630.12×50=660×0.5=30 1.8×0.04=0.0721.25×8=1024×0.05=1.20.15×0.4=0.060.9×1.5=1.353.4×0.7=2.380.78×0.2=0.15630×0.5=150.8×0.9=0.7241．【解答】解：（1）0.5×0.2=0.1（2）50×0.2=10（3）500×0.2=100（4）2.4×4=9.6（5）2.5×0.4=1（6）0.25×40=10（7）0.125×8=1（8）12.5×8=100（9）1.25×80=100（10）0.24×5=1.242．【解答】解：0.5×2=10.25×4=112.5×8=1000.125×8=17÷0.7=101﹣0.125×8=01.25×32=800.25×56=1443．【解答】解：0.4×0.3=0.122.5×0.6=1.58.8×0.1=0.881.3×0.2=0.265.28+1.6=6.8810﹣1.7﹣2.3=66.09×0=0100×0.7=7044．【解答】解：0.5×0.2=0.10.25×0.4=0.1 1.25×8=100×1000+3=30.5÷100=0.0050.12×40=4.8100×0.78=7812.78+0.22=130.6+0+0.7=1.30.72+1000=1000.7245．【解答】解：0.5×0.2=0.14×0.15=0.650×0.4=208×0.125=10.23×10=2.30.12×7=0.8446．【解答】解：0.7×0.9=0.63 2.6×0.5=1.30.14×0.3=0.0425.5×10=551.7×0.03=0.0511.8×0.04=0.0720.12×6=0.72 4.8×5=2447．【解答】解：0.2×0.4=0.088.2+1.8=10100﹣35.22=64.782.5×0.4=10.8×50=408×0.24=1.923.9×1.3=5.07 2.4×5=120.9﹣0.52=0.380×3.52=012.5×8=100 2.4×0.01=0.02448．【解答】解：0.8×0.6=0.48 5.5×3=16.50.5×0.6=0.30.125×0.8=0.19.6×0.1=0.96 0.07×0.9=0.06312.4×0.2=2.482.4×5=1214×0.01=0.141.5×2=3 49．【解答】解：0.37×100=370.25×4=10.3×0.2=0.0670×0.12=8.418×0.3=5.40.5×0.6=0.33.7×0.2=0.745×1.2=6第二部分竖式300道参考答案与试题解析一．计算题（共50小题）1．【解答】解：（1）75﹣8.49=66.51；（2）3.72×1.25=4.65；（3）5.04×26=131.04；（4）5.94+12.7=18.64；（5）0.95×6.7=6.365；（6）35.62﹣13.4=22.22．2．【解答】解：0.64×18=11.5225.8×102=2631.640.7×0.25=10.17513.45×2.6≈35 4.865×8≈3910.23×42≈429.73．【解答】解：2.18×3.6=4.848*4.23×0.86=3.6378验算：20.07×1.025=20.571750.6×0.9=0.540.57×0.86=0.4902*0.8×0.31=0.248验算：4．【解答】解：①8×0.12=0.96 ② 1.9×3.5=6.65③0.401×0.3=0.1203④0.45×0.96=0.432⑤0.17×0.71=0.12075．【解答】解：（1）4.57×1.8=8.226；（2）0.125×0.8=0.1；（3）3.75×0.24=0.9；（4）9.37×8.5=79.645；（5）2.07×3.6=7.452；（6）3.35×1.6=5.36．6．【解答】解：1.8×0.36=0.64835.37+28.63=6419.9﹣8.75=11.15 1.06×0.48=0.508818.9+28.65=47.5522.87﹣18.65=4.227．【解答】解：（1）7.6×0.82=6.232；（2）3.25×0.31=1.0075；（3）7.5×0.59=4.425．8．【解答】解：25.78+3.12=28.913.8×9=124.2*8﹣2.67=5.33验算：*5.73+6.7=12.43验算：9．【解答】解：4.8×17=81.6 1.88×25=47 2.4×0.37=0.8880.89×5.3=4.71710．【解答】解：3.8×0.15=0.57 4.6×50=2308.7×2.04=17.74813.2×9.8=129.360.86×0.72=0.61925﹣1.08=3.9211．【解答】解：2.375×105≈249.38 5.16×4.3≈22.190.45×0.206≈0.0912．【解答】解：4.8×0.25=1.29.3×1.3=12.099.8×0.5=4.9 2.1×2.15=4.51513．【解答】解：0.04×0.12=0.0048 4.25×8.8=37.43.84×0.25=0.95214．【解答】解：62.4+7.62=70.02 6.07﹣4.993=1.0778.7×1.4=12.18 1.28×3.5=4.4815．【解答】解：（1）8×0.125=1（2）4.23×5=21.15（3）36.5×4=146（4）25×0.126=3.15（5）18×1.8=32.4（6）33.42×20=668.416．【解答】解：2.3×0.8=1.84 6.9×3.1=21.399.87×1.8=17.76624.5×6.8=166.620.6×4.5=92.710.2×5.01=51.10217．【解答】解：2.02×2.4=4.84810.33﹣9.08=1.253.88+1.54=5.4218．【解答】解：3.5×7=24.58.1×16=129.6 3.27×21=68.67 5.63×36=202.68 4.32×7=30.2464×0.07=4.4819．【解答】解： 4.26×7.5=31.95 3.15× 1.4=4.4147.5×0.6=28.5 5.25×0.24=1.267.38×2.5=18.4514.24×0.35=4.984 1.21×8=9.68 2.4×0.2=0.480.57×0.43=0.245120．【解答】解：8.5×16=136； 4.15×24=99.6；0.32×7=2.24； 6.4×9=57.6； 2.5×36=90；0.04×270=10.8； 1.25×3=3.75； 3.75×6=22.5；21．【解答】解：0.56×0.04=0.0224验算：8.04×0.001=0.00804验算： 4.012×0.3=1.2036验算：0.42×0.08=0.0336验算：0.209×0.15=0.03135验算：4.8×0.0015=0.0072验算：87.5×2.4=210验算：10.28×0.7=7.196验算：31.4×3.8=119.32验算：22．【解答】解：0.82×2=1.64 3.95×42=165.9 2.073×15=31.0950.78×24=18.72 2.6×61=158.60.059×0.2=0.0118 4.268×1.7=7.255657×5.7=32.499.46×2.85=26.96117.8×6.4=113.92 1.5×4.9=7.35 2.5×0.88=2.223．【解答】解： 1.24×0.8=0.9920.85× 1.2=1.027.05×2.4=16.9212.3×2.4=29.5260.5×400=242089.3×7.6=678.6824．【解答】解：0.46×3.5=1.610.86×1.4≈1.200.036×2.5=0.098.4×1.03≈8.6525．【解答】解：25﹣12.54=12.46 1.59×2.4=3.8162137÷29≈73.726．【解答】解：1.5×0.2=0.3 1.25×0.8=1 4.5×0.4=1.82.5×7×0.4=70.3×0.3=0.090.35+0.75=1.10.48+1.62=2.110.1×78=787.827．【解答】解： 5.08×0.65=3.30254.68﹣12.8=41.8819.92+420.26=440.187.02×0.67=4.7034 28．【解答】解：4.8×2.5=12 5.07×0.29=1.47030.32×1.7≈0.54.08×6.7≈27.34 6.03×0.74≈4.4629．【解答】解：3.52×0.05≈0.18120.44×0.2≈24.098.25×1.4=11.558.76×3.5=30.66 4.25×0.4=1.7 2.7×1.6=4.3230．【解答】解：（1）0.43×27≈11.6（结果保留一位小数）（2）0.04×0.12=0.0048 （3）3.84×2.6≈10.0（保留一位小数）（4）5.76×3=17.28（5）8.3×0.15≈1.25（结果精确到百分位）（6）0.125×1.4≈0.18（保留两位小数）（7）4.8×0.25=1.231．【解答】解：0.38×0.25=0.095150×0.12=180.87×1.9=1.653 1.28×2.3=2.944 2.07×0.24=0.49680.17×1.05=0.178532．【解答】解：0.65× 4.7=3.055 2.06×9.4=19.3640.072×8.5=0.6129.9×0.99=9.801 2.04×0.8=1.63233．【解答】解：3.2×30=96 1.25×4=5 4.2×15=6311.5×108=12420.28×4.5=1.260.27×0.36=0.0972 2.6×3.8=9.88250×0.98=245 6.05×1.6=9.6810.8×2.07=22.35634．【解答】解：（1）0.54×2.7=1.458；（2）2.8×7.4=20.72；（3）15.4×0.7=10.78；（4）27.5×3.4=93.5．35．【解答】解：27.6×0.45=12.428.08﹣2.68=5.4 5.546+29.38=34.9260.023×1.8=0.248417.04×0.26=4.43048.35×3.5=29.225 5.08×0.25=1.27 1.18×3.4=4.01236．【解答】解：2.6×0.6=1.56 6.7×0.07=0.46915.6×1.3=20.280.81×2.7=2.18737．【解答】解：①3.65×2.6≈9.5②0.462÷ 2.8≈0.2③0.627+3.375≈ 4.0④4.35﹣0.435≈3.938．【解答】解：31.5×24.5=771.750.8×0.56=0.448 4.23×0.028=0.118440.63×1.05=0.661536×0.56=0.2016 2.5×2.05=5.12539．【解答】解：（1）2.3×0.29=0.667 2.7×1.02=2.754（2）0.45×0.96≈0.43 6.53×0.75≈4.90（3）10.6×0.26≈2.822.45×0.4≈9.040．【解答】解：0.34×2.5=0.85；1.5× 1.7=2.55；0.28×0.39=0.1092； 4.2×2.4=10.08．41．【解答】解：4.2×0.08=0.336 1.5×6.2=9.3 2.7×8.17=22.059 2.9×0.56≈ 1.62 6.23× 4.2≈26.242．【解答】解：①3.4×0.25=0.85②6.5×2.4=15.6③0.035×0.6=0.021④1.25×0.024=0.0343．【解答】解：84×0.25=210.55×64=35.20.47×5.8=2.726 6.06×0.32=1.93920.075×0.07=0.00525 3.7×9.77=36.14944．【解答】解：5.08×0.65=3.30254.68﹣12.8=41.8880.4×0.35=28.1419.92+420.26=440.1845．【解答】解：3.2×1.8=5.76 1.05×62=65.12.7×0.11=0.2970.12×0.18=0.02160.15×0.12=0.018 2.7×1200=324046．【解答】解：（1）7.6×0.82=6.232（2）3.5×8.8=30.8（3）3.25×0.31=1.0075（4）0.93×2.02≈1.88（5）5.9×3.14≈18.547．【解答】解：（1）1.2×1.36≈1.63 （2）2.7×0.34≈0.92 （3）0.74×5.8≈4.29（4）2.6×3.5=9.1验算：（5）0.25×0.12=0.03验算：48．【解答】解：18.8×38.2=718.16；48×0.952=45.696；35.7×5.06≈180.6；（得数保留一位小数） 6.928×3.2≈22.17；（得数保留两位小数）49．【解答】解：（1）0.86×7=6.02（2）3.3×16=52.8（3）0.48×2.4=1.152（4）1.7×0.45≈0.77（保留两位小数）50．【解答】解：0.38×0.25=0.095验算：1.07×2.1≈ 2.257.4× 2.84≈21.0 1.08×9.5=10.260.019×5.7=0.10830.75×1.02=0.765。

五年级上册数学第一课口算题
一、小数乘法相关口算题
1. 公式
- 解析：计算时，先按照整数乘法计算公式，然后看因数中一共有一位小数，就从积的右边起数出一位点上小数点，所以结果是公式。

2. 公式
- 解析：按照整数乘法公式，因数中有一位小数，从积的右边起数出一位点上小数点，得到公式，也就是公式。

3. 公式
- 解析：先算公式，因数中有一位小数，所以结果是公式。

4. 公式
- 解析：先算公式，两个因数中一共有两位小数，从积的右边起数出两位点上小数点，结果是公式。

二、小数除法相关口算题（如果第一课有涉及简单除法概念的话）
1. 公式
- 解析：把公式看作6个公式，6个公式平均分成3份，每份是2个公式，也就是公式。

2. 公式
- 解析：把1平均分成5份，每份是公式，也可以想公式，被除数缩小到原来的公式，商也缩小到原来的公式，所以公式。