GCF & LCM Review

Prime Factorization

100

Prime factorization of 16

2⁴

200

Prime Factorization of 42

2*3*7

300

Prime factorization of 105

5*3*7

400

Prime factorization of 270

2* 3³* 5

500

Prime factorization of 3528

2³* 3³* 7²

Mixed

100

Find the LCM of 12 and 10

What is 60

200

What is the GCF of 28 and 40?

GCF is 4

300

What is the LCM of 15 and 9

45

400

Find the LCM of 7,21 and 35

What is 105

500

What is the greatest common factor of 27,9,54?

What is 3

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

Write the sum of the numbers as the product of their GF and another sum. 

32+ 20 

4 X (8+5)

200

You bring snacks for your basketball team every fifth game. Every third game is a home game. When will be the first time that you bring snacks to a home game?

15th game

300

Sarah is making bead necklaces. She has 60 blue beads and 72 green beads. What is the greatest number of identical necklaces she can make if she wants to use all the beads?

6

400

Juanita runs every third day and swims every fifth day. If Juanita runs and swims today, in how many days will she run and swim again on the same day?

 in 15 days 

500

28 girls and 32 boys volunteer to plant trees at a school. The principal divides the girls and boys into identical groups that have girls and boys in each group. What is the GREATEST number of groups the principal can make?

4 groups.