Divisibility Rules

Front

What is a divisibility rule?

Back

A divisibility rule is a shortcut that helps determine if one number is divisible 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 it ends in 0 or 5.

Front

What is the divisibility rule for 6?

Back

A number is divisible by 6 if it is divisible by both 2 and 3.

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 2520 divisible by 6?

Back

Yes, because it is divisible by 2 (even) and 3 (sum of digits is a multiple of 3).

Front

Is 7154 divisible by 2?

Back

Yes, because the last digit is 4, which is even.

Front

Is 1284604 divisible by 2?

Back

Yes, because the last digit is 4, which is even.

Front

What does it mean if a number is prime?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.