Factors, Multiples, GCF, LCM

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder.

Front

List the factors of 24.

Back

1, 2, 3, 4, 6, 8, 12, 24

Front

What is a multiple?

Back

A multiple is a number that can be divided by another number without a remainder.

Front

List the first five multiples of 11.

Back

11, 22, 33, 44, 55

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 GCF of 10 and 25?

Back

List the factors: Factors of 10: 1, 2, 5, 10; Factors of 25: 1, 5, 25. The GCF is 5.

Front

What is the least common multiple (LCM)?

Back

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

Front

How do you find the LCM of 4 and 5?

Back

List the multiples: Multiples of 4: 4, 8, 12, 16, 20; Multiples of 5: 5, 10, 15, 20. The LCM is 20.

Front

What is a prime number?

Back

A prime number is a number that has only two factors: 1 and itself.

Front

Is 9 a prime number? Why or why not?

Back

No, because it has factors 1, 3, and 9.