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11-11-2020
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Divisibility rule of 13

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littleTTTurtles littleTTTurtles

11-11-2020

Add for times the last digit to the remaining leading truncated number. If the result is divisible by 13, then so was the first number. Apply this rule over and over again as necessary.
Explication: I did this last year, hope this helps! :)

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