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Double the last digit. Subtract it from the rest. If the result is divisible by 7, the original number is divisible by 7.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoDouble the last digit and subtract it from the others.
Example: 357
7 x 2 = 14
35 -14 = 21
21 is a multiple of 7.
357 is a multiple of 7.
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