Finding Greatest Common Factor

Front

What is the greatest common factor (GCF)?

Back

The greatest common factor (GCF) is the largest number that divides two or more numbers without leaving a remainder.

Front

How do you find the GCF of two numbers?

Back

To find the GCF, list the factors of each number, then identify the largest factor that appears in both lists.

Front

What are factors?

Back

Factors are numbers that can be multiplied together to get another number.

Front

Find the GCF of 30 and 45.

Back

15

Front

Find the GCF of 16 and 24.

Back

8

Front

Find the GCF of 80 and 120.

Back

40

Front

Find the GCF of 90 and 135.

Back

45

Front

Find the GCF of 50 and 75.

Back

25

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.