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2013-03-13 10:27:03| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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1+2+3.......+20=210(拨10遍)

习题:

在计算时,请先想好口诀!再进行计算.....

91+9= (加9口诀:个位减1,十位减9,百位进1)

92+9=

94+8= (加8口诀:个位减2,十位减9,百位进1)

96+8= (加8口诀:个位减2双上8,十位减9,百位进1)

94+7= (加7口诀:个位减3,十位减9,百位进1)

98+7= (加7口诀:个位减3,十位减9,百位进1)

99+6= (加6口诀:个位减4,十位减9,百位进1)

95+6= (加6口诀:个位减4双上6,十位减9,百位进1)

99+5= (加5口诀:个位减5,十位减9,百位进1)

5+95=

98+4= (加4口诀:个位减6,十位减9,百位进1)

97+4=

99+3= (加3口诀:个位减7,十位减9,百位进1)

97+3=

8+92= ( 加2口诀:个位减8,十位减9,百位进1)

9+92=

1+99= (加1口诀:个位减9,十位减9,百位进1)

试着练一练

210+21＝231（够加直加）

231+22＝253（十位先加20双下8，个位加2）

253+23＝276（十位够加直加，个位加3双下7）

276+24＝300（十位够加直加，个位加4，个位减6十位减9百位进1）

300+25＝325（够加直加)

325+26＝351（先加20再加6，个位减4双上6，十位进1双下9）

351+27＝378（够加直加）

378+28＝406（先加20再加8，个位减2十位减9百位进1）

406+29＝435（先加20再加9，个位减1十位进1）

435+30＝465（先加30双下7）

放松一下:

仔细观察,认真找一找.....

练一练 - 小新 - chongwenaiwobaobei

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