LCM

Two faucets are dripping. One faucet drips every 4 seconds and the other faucet drips every 9 seconds. If a drop of water falls from both faucets at the same time, how many seconds will it be before you see the faucets drip at the same time?

• 18 seconds

• 36 seconds

• 72 seconds

• 1 second

Find the least common multiple for 5 and 9.

• 18

• 25

• 45

What is the least common multiple (LCM) of 4 and 10?

• 4

• 40

• 15

• 20

Is this question asking to find GCF or LCM?

• GCF

• LCM

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

Find the Least Common Multiple (LCM) of 12 & 30

• 30

• 36

• 60

• 90

Sapphire and Abe are shelving books at a public library. Sapphire shelves 5 books at a time, whereas Abe shelves 6 at a time. If they end up shelving the same number of books, what is the smallest number of books each could have shelved

• 5

• 6

• 25

• 30

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?

• 6

• 12

• 18

• 36

A radio station is having a promotion in which every 12th caller receives a free concert ticket and every 15th caller receives a limo ride. Which caller will be the first one to win both?

• 20

• 30

• 60

• 80

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many seconds will they blink together again?

• 48 seconds

• 45 seconds

• 16 seconds

• 8 seconds