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小学数学，因数和倍数，7的倍数特征，减去截取数字的2倍
对于位数较少的数，判断它是否是7的倍数。可以把这个数的个位数字截去，再从余下的数中减去截去数字的2倍，如果差是7的倍数，那么这个数就是7倍数。比如：133 13-3×2=7 7是7的倍数，则133就是7的倍数。 491678是否是7的倍数？
小升初数学总复习14/299
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