Divisibility Rules

Front

What is a divisibility rule?

Back

A divisibility rule is a shortcut that helps determine if one number can be divided by another without performing the actual division.

Front

What is the divisibility rule for 2?

Back

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

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 its last digit is 0 or 5.

Front

What is the divisibility rule for 10?

Back

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

Front

Is 81 divisible by 3?

Back

Yes, because 8 + 1 = 9, and 9 is divisible by 3.

Front

Is 40,500 divisible by 6?

Back

True, because it is divisible by both 2 (last digit is 0) and 3 (4 + 0 + 5 + 0 + 0 = 9).

Front

Is 816 divisible by 3?

Back

Yes, because 8 + 1 + 6 = 15, and 15 is divisible by 3.

Front

Which of the following statements is true of the number 360?

Back

It is divisible by 2, 3, 5, 6, 9, and 10.

Front

Which of the following statements is true of the number 72?

Back

It is divisible by 2, 3, 4, 6, and 9.