Greatest Common Factors and Prime Numbers

Front

What is the Greatest Common Factor (GCF)?

Back

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

Front

How do you find the GCF of two numbers?

Back

List the factors of each number and identify the largest factor that they have in common.

Front

What is a prime number?

Back

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

Front

Is 1 a prime number?

Back

No, 1 is not considered a prime number.

Front

What is the prime factorization of a number?

Back

The prime factorization of a number is expressing it as a product of prime numbers.

Front

Find the GCF of 12 and 18.

Back

The GCF is 6.

Front

Find the GCF of 30 and 45.

Back

The GCF is 15.

Front

What is the Least Common Multiple (LCM)?

Back

The LCM of two or more numbers is the smallest number that is a multiple of all of them.

Front

How do you find the LCM of two numbers?

Back

List the multiples of each number and identify the smallest multiple that they have in common.

Front

Find the LCM of 4 and 5.

Back

The LCM is 20.