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加法的简便运算 四年级 岳爱珍 - PowerPoint PPT Presentation


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加法的简便运算 四年级 岳爱珍. 比比谁最棒。 78=80- 99=100- 574+200= 87=90- 101=100+ 453-300=. 1. 2. 774. 3. 1. 153. 1 、 113+59=113+60-1=. 172. 2 、 276+98=276+100. -. 2.

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加法的简便运算四年级 岳爱珍


1

2

774

3

1

153

1、113+59=113+60-1=

172

2、276+98=276+100

-

2

=374


=

判断:

86+89=80+89+6=175 ( )

99+136=136+100+1 ( )

99+136=136+100+1 ( )