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# å æ³çç®ä¾¿è¿ç® åå¹´çº§ å²³ç± - PowerPoint PPT Presentation

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### 加法的简便运算四年级 岳爱珍

• 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

=374

156+87=156+90
• 74+198=

=

86+89=80+89+6=175 （ ）

99+136=136+100+1 （ ）

99+136=136+100+1 （ ）