Divisibility Rules

Front

What is the divisibility rule of 2?

Back

All even numbers have a factor of 2.

Front

What are factors?

Back

Numbers that are multiplied together.

Front

What is the divisibility rule for 3?

Back

Add up the digits. The sum must be divisible by 3.

Front

Why is 1 neither prime nor composite?

Back

Because it only has 1 factor: itself.

Front

What is the divisibility rule for 5?

Back

The last digit needs to be a 5 or 0.

Front

What is a prime number?

Back

A number greater than 1 that has no positive divisors other than 1 and itself.

Front

What is a composite number?

Back

A number greater than 1 that has more than two positive divisors.

Front

What is the divisibility rule for 4?

Back

The last two digits of the number must form a number that is divisible by 4.

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 10?

Back

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