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Divisibility (Basic)
math/learn/divisibility/
Divisibility is a good skill to memorize. Here are some basic divisibility rules.
A number is divisible by 2 if the last digit is 0, 2, 4, 6, or 8.
A number is divisible by 3 if the sum of all the digits in the number is divisible by 3.
(eg. 756 is divisible by 3 because 7+5+6=18, 18 is divisible by 3, so 756 is divisible by 3.)
A number is divisible by 4 if the last two digits of the number are divisible by 4.
(eg. 524 is divisible by 4 because 24 is divisible by 4.)
A number is divisible by 5 if the last digit is 0 or 5.
A number is divisible by 6 if it is divisible by both 2 and 3.
A number is divisible by 10 if the last digit is 0.
 
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