巧算“十几减9” :就是把被减数 个位上的数加1就是“十几减9”的
减9去十尾加1
12-9=( 2 )+( 1 )=( ) 14-9=( 4 )+( 1 )=( ) 17-9=( )+( )=( ) 13-9=( )+( )=( ) 15-9=( )+( )=( ) 11-9=( )+( )=( ) 16-9=( )+( )=( ) 18-9=( )+( )=( )
有 15 个气球, 卖了 9 个。
还有几个?
方 法 一:
一 个 一 个 的 减
15 – 9 = 6 15
方 法 二:破十法
15 - 9 =6
5 10 1
方 法 三: 平十法
15 - 9 =6
54
10
方法四:想加法,算减法
想:因为:9 +( 6 )= 15 所以:15 - 9 =( 6 )
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