The rule for divisibility by numbers ending in 7

The rule for divisibility by tables of numbers ending in 7

The first way





*It's the same by {7,17,27,37,47,57,67,77...}

   The second way



**It's the same by {7,17,27,37,47,57,67,77...}

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The rule for divisibility by numbers ending in 3

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