一年级数学下册第1单元加与减(一)《做个减法表》习题课件(新版)北师大版.ppt

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做个减法表,巩固20以内退位减法的计算,1( )里填几? 16( )8 13( )8 14( )8 11( )8 15( )8 12( )8,8,5,6,3,7,4,2写一写。,10,1,12,3,13,4,6,6,4,8,5,7,(答案不唯一),3算一算,你发现了什么? 1393( )( ) 1383( )( ) 1373( )( ) 1363( )( ) 我发现:计算十几减几的退位减法时,可以直接用被减数个位上的数加上( )减去减数的差。,1,4,2,5,3,6,4,7,10,4在 里填数,使每条线上的三个数相加等于中间的数。,5,9,10,9,5,2,5,

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