If a number ends with 0, it is divisible by 10.
If a number ends with 5 or 0, it is divisible by 5.
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Every number that ends in 0 is a multiple of both 5 and 10. Multiples of 5 always end in 0 or 5 and multiples of 10 always end in 0. 0 is the only common last digit
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.