方法二:破十法
11 - 2 = 9
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1 10 ②
8
③
11减几
11-2= 9(只)
方法三:平十法
11 - 2 = 9
①
11
②
10
③
11减几 11-2= 9(只)
方法四:想加法算减法 先想:2 +( ?)=11 因为 2 + 9 =11 所以 11 - 2=9
试一试
11-9= 2
方法一:破十法
11 - 9 = 2
西师大版 数学 一年级 上册
6 20以内的退位减法
11减几
第1课时
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