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 (ones place) is even (0, 2, 4, 6, or 8).

Front

Is 27 divisible by 2?

Back

No, because the last digit is 7, which is odd.

Front

What is the divisibility rule for 3?

Back

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

Front

Is 7,521 divisible by 3?

Back

Yes, because 7 + 5 + 2 + 1 = 15, and 15 is a multiple of 3.

Front

What is the divisibility rule for 5?

Back

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

Front

Is 230 divisible by 10?

Back

Yes, because it ends in 0.

Front

What is the divisibility rule for 10?

Back

A number is divisible by 10 if it ends in 0.

Front

Is 78 divisible by 2?

Back

Yes, because the last digit is 8, which is even.

Front

Is 23 divisible by 3?

Back

No, because the sum of the digits (2 + 3 = 5) is not a multiple of 3.