Rules of Divisibility

Front

What is the rule for divisibility by 2?

Back

A number is divisible by 2 if its last digit is even (0, 2, 4, 6, or 8).

Front

Is 266,489 divisible by 2?

Back

No, because the last digit is 9, which is odd.

Front

What is the rule for divisibility by 3?

Back

A number is divisible by 3 if the sum of its digits is divisible by 3.

Front

Is 139 divisible by 3?

Back

No, because the sum of the digits (1 + 3 + 9 = 13) is not divisible by 3.

Front

What is the rule for divisibility by 5?

Back

A number is divisible by 5 if its last digit is 0 or 5.

Front

Is 100,405 divisible by 10?

Back

No, because the last digit is 5, not 0.

Front

What is the rule for divisibility by 10?

Back

A number is divisible by 10 if its last digit is 0.

Front

Is 441 divisible by 2?

Back

No, because the last digit is 1, which is odd.

Front

Is 48 divisible by 3?

Back

Yes, because the sum of the digits (4 + 8 = 12) is divisible by 3.

Front

What is the rule for divisibility by 4?

Back

A number is divisible by 4 if the last two digits form a number that is divisible by 4.