GCF & LCM Review

Factors

100

List all of the factors of 32.

1, 2, 4, 8, 16, and 32

200

List all of the common factors of 12 and 20.

1, 2, and 4

300

List all of the factors of 42.

1, 2, 3, 6, 7, 14, 21, 42

400

List all of the factors of 36.

1, 2, 3, 4, 6, 9, 12, 18, 36

500

List all of the common factors of 24 and 36.

1, 2, 3, 4, 6, 12

Multiples

100

List 3 multiples of 8 that are less than 50.

8, 16, 24, 32, 40, 48

200

List 3 common multiples of 2 and 6.

6, 12, 18, 24, 30, 36, 42, 48, etc.

300

List all the common multiples of 6 and 8 that are less than 50.

24 and 48

400

List 4 multiples of 7 greater than 10 but less than 50.

14, 21, 28, 35, 42, 49

500

List all the common multiples of 12 and 8 that are less than 50. 

24 and 48

Greatest Common Factor

100

What is the greatest common factor of 12 and 15

3

200

What is the greatest common factor of 24 and 20?

4

300

What is the greatest factor of 16 and 36?

4

400

What is the great common factor of 50, 35, and 15?

5

500

What is the greatest common factor of 64 and 80?

16

Least Common Multiple

100

What is the least common multiple of 3 and 7?

21

200

What is the least common multiple of 4 and 9?

36

300

What is the least common multiple of 2, 3, and 5?

30

400

What is the least common multiple of 20 and 12?

60

500

What is the least common multiple of 21 and 24?

168

Random

100

List all the common factors 12 and 20

1, 2, 4

200

List all the common factors of 48, 16, and 12

1, 2, 4

300

Find the LCM of 48 and 24 

6

400

Wilma is thinking of a number that is divisible by both 17 and 8.  What is the smallest possible number that Wilma could be thinking of?

1

500

Find the LCM of 4 and 9

36