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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.

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12y ago
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12y ago

Double 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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Q: What is the rule of division for 7?
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