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lihb/19乘法.md

Created May 2, 2014 02:02
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19以内的两位数的乘法
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19乘法.md

19以内的两位数的乘法

这个方法是在微信上看到的，据说是印度阿三流行出来的。记录下来 备用。

19×13 = (19+3) × 10 + 9 × 3 = 220 + 27 = 247

16*18 = (16+8) × 10 + 6 × 8 = 240 + 48 = 288

的确很快很好用。

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