Period 2 LCM

What is the least common multiple (LCM) of 3 and 20?

• 60

• 40

• 20

• 3

What is the least common multiple (LCM) of 8 and 5?

• 50

• 40

• 5

• 8

Find the Greatest Common Factor (GCF) OF 32 and 64.

• 1

• 2

• 4

• 32

Find the Greatest Common Factor (GCF) of 60 and 75

• 1

• 3

• 5

• 15

Find the Greatest Common Factor (GCF) OF 12,  18 & 30

• 1

• 3

• 6

• 12

Avery gets newsletters by e-mail. He gets one for sports every 5 days, one for model railroads every 10 days, and one for music every 8 days. If he got all three today, how many more days will it be until he gets all three newsletters on the same day again? 

• 80 days

• 40 days

• 50 days

• 60 days

The school cafeteria serves tacos every sixth day and cheeseburgers every eight day. If tacos and cheeseburgers are both on today’s menu, how many days will it be before they are both on the menu again?

• 14 days

• 24 days

• 34 days

• 44 days

Two clocks are turned on at the same time. One clock chimes every 15 minutes. The other clock chimes every 25 minutes. In how many minutes will they chime together?

• 55 minutes

• 25 minutes

• 60 minutes

• 75 minutes

Boxes that are 12 inches tall are being stacked next to boxes that are 18 inches tall. What is the shortest height at which the two stacks will be the same height?

• 24

• 18

• 36

• 72

If Juanita runs every third day and swims every fifth day, what is the first day that she will both run and swim again? 

• 5

• 15

• 45

• 30