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if the number ends on 5 or 0 the number is divisible by 5
If the rules for 2 and 3 work, the number is divisibale by 5.
If the number ends in 5 or 0 the whole number is divisible by 5.
If a number ends with 0, it is divisible by 10. If a number ends with 5 or 0, it is divisible by 5.
There is no divisibility rule for 13 because it is a prime number. If you are thinking: why is there a divsibility rule for 2 and 3 then. Well, i don't know so go look it up on google.