Divisibility Rules Practice

Front

What is the divisibility rule for 3?

Back

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

Front

What is the divisibility rule for 5?

Back

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

Front

What is the divisibility rule for 9?

Back

A number is divisible by 9 if the sum of its digits is divisible by 9.

Front

Is 505,101 divisible by 3?

Back

Yes, it is divisible by 3.

Front

Which of the following numbers is divisible by 9: 648, 289, 856, 443?

Back

648 is divisible by 9.

Front

What number are 20 and 100 both divisible by?

Back

They are both divisible by 10.

Front

What numbers is 81 divisible by?

Back

81 is divisible by 3 and 9.

Front

If a number ends in an even digit, is it divisible by 2?

Back

Yes, a number that ends in 0, 2, 4, 6, or 8 is divisible by 2.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

What is a composite number?

Back

A composite number is a number that has more than two factors.