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Divisibility Rules

TermDefinition
divisible by 2 last digit is even
divisible by 3 sum of the digits is divisible by 3
divisible by 4 if the last two digits are divisible by 4
divisible by 5 if the last digit is 5 or 0
divisible by 6 if the number is even and divisible by 3
divisible by 7 Take the last digit, double it, and subtract it from the rest of the number; if the answer is divisible by 7 (including 0)
divisible by 8 last three digits are divisible by 8
divisible by 9 sum of the digits is divisible by 9
divisible by 10 if the last digit is 0
divisible by 11 Add and subtract digits in an alternating pattern (add digit, subtract next digit, add next digit, etc). Then check if that answer is divisible by 11.
divisible by 12 if the number is divisible by 3 & 4
Created by: Lachelle
 

 



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