GCF and LCM

Front

What is the GCF (Greatest Common Factor)?

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 14 and 20?

Back

List the factors of each number: Factors of 14: 1, 2, 7, 14; Factors of 20: 1, 2, 4, 5, 10, 20. The GCF is 2.

Front

What is the LCM (Least Common Multiple)?

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 18 and 27?

Back

List the multiples of each number: Multiples of 18: 18, 36, 54, 72, 90...; Multiples of 27: 27, 54, 81, 108... The LCM is 54.

Front

What are factors?

Back

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

Front

List all the factors of 12.

Back

1, 2, 3, 4, 6, 12.

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 35 prime or composite?

Back

Composite, because it has factors other than 1 and itself (1, 5, 7, 35).

Front

What are the factors of 25?

Back

1, 5, 25.

Front

What is the relationship between GCF and LCM?

Back

The product of the GCF and LCM of two numbers is equal to the product of the numbers.