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 52.

1, 2, 4, 13, 26, and 52

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 18 that are less than 75.

36 and 72

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

Word Problems

100

Timer 1 is set to beep every 8 minutes. Timer 2 is set to beep every 6 minutes. Within 30 minutes, How many times will they beep together? Identify the minute (s) where they will beep together. 

Also- Identify if this is a LCM or GCF question

one time- at the 24th minute

LCM

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?

LCM or GCF?

LCM- 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?

GCF- 6

400

Three pigs entered a race around a track. Piggly takes 12 minutes to run one lap. Piglet takes 6 minutes to run one lap and it takes Wiggly 16 minutes to run one lap. If all three pigs begin the race at the same time, how many minutes will it take for all three pigs to be at the starting point again?

LCM- 48 minutes

500

Johnny baked 36 oatmeal cookies and 48 chocolate chip cookies to package in plastic containers for his teacher friends at school. He wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If he wants each container to have the greatest number of cookies possible, how many plastic containers does he need?

GCF- 12 plastic containers