for 3: count all number if divisable by 3 (123= 1+2+3= 6, 3+3=6)
for 5:end number is 5 or 0
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If the rules for 2 and 3 work, the number is divisibale by 5.
2.50
It is 3 6 9
3 - 31
if the number ends on 5 or 0 the number is divisible by 5