Divisibility Rules Practice

Front

What is the rule for determining if a number is divisible by 3?

Back

To determine if a number is divisible by 3, find the sum of its digits. If that sum is a multiple of 3, then the number is divisible by 3.

Front

Is the number 72 divisible by 3?

Back

Yes, because the sum of the digits (7 + 2 = 9) is a multiple of 3.

Front

Which number is divisible by both 3 and 9?

Back

7,002 is divisible by both 3 and 9.

Front

What is the rule for determining if a number is divisible by 5?

Back

A number is divisible by 5 if it ends in 0 or 5.

Front

Is the number 712,300 divisible by 5?

Back

Yes, because it ends in 0.

Front

What is the rule for determining if a number is divisible by 9?

Back

To determine if a number is divisible by 9, find the sum of its digits. If that sum is a multiple of 9, then the number is divisible by 9.

Front

Is the number 108 divisible by 9?

Back

Yes, because the sum of the digits (1 + 0 + 8 = 9) is a multiple of 9.

Front

What are the divisibility rules for 3, 5, and 9?

Back

Divisibility by 3: sum of digits is a multiple of 3. Divisibility by 5: number ends in 0 or 5. Divisibility by 9: sum of digits is a multiple of 9.

Front

Can a number be divisible by both 3 and 9?

Back

Yes, if a number is divisible by 9, it is also divisible by 3.

Front

What is an example of a number that is divisible by 3 but not by 9?

Back

Any number whose digit sum is a multiple of 3 but not 9, such as 12 (1 + 2 = 3).