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 leaving a remainder.

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

Is 81 divisible by 3?

Back

Yes, because the sum of its digits (8 + 1 = 9) is divisible by 3.

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

Which of the following is an even number: 1, 9, 4, 5?

Back

4 is an even number.

Front

What is the divisibility rule for 5?

Back

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

Front

Which of these is divisible by 9: 1308, 495, 361, 842?

Back

495 is divisible by 9 because the sum of its digits (4 + 9 + 5 = 18) is divisible by 9.

Front

What is the divisibility rule for 10?

Back

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

Front

Is 64 divisible by 2?

Back

Yes, because its last digit (4) is even.

Front

What is the divisibility rule for 4?

Back

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