Divisibility Rules

Front

Divisible by 2

Back

Even numbers. Ends in 0, 2, 4, 6, or 8.

Front

Divisible by 3 and 9

Back

Add up digits in number and that sum shares divisibility. Repeat if necessary.

Front

Divisible by 5

Back

ends in 0 or 5

Front

Divisible by 10

Back

ends in a 0

Front

Divisible by 6

Back

if a number is divisible by both 2 and 3

Front

Divisible by 7

Back

No shortcut. Do long division.