Greatest Common Factor

Front

What is the Greatest Common Factor (GCF)?

Back

The GCF is the largest number that divides two or more numbers without leaving a remainder.

Front

How do you find the factors of a number?

Back

To find the factors of a number, list all whole numbers that can be multiplied together to get that number.

Front

What are the factors of 25?

Back

1, 5, 25

Front

What are the factors of 12?

Back

1, 2, 3, 4, 6, 12

Front

What is the GCF of 8 and 20?

Back

4

Front

What is the GCF of 12 and 28?

Back

4

Front

What is the GCF of 16 and 18?

Back

2

Front

If the GCF of two numbers is 1, what does that mean?

Back

It means the two numbers are coprime, having no common factors other than 1.

Front

What is a prime number?

Back

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

Front

What is a composite number?

Back

A composite number is a number that has more than two positive divisors.