Least Common Multiple practice

Front

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

Back

45

Front

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

Back

24

Front

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

Back

75

Front

A radio station is giving away a $100 bill to every 30th caller and movie tickets to every 40th caller. Which caller will be the first to win both prizes?

Back

120

Front

Melanie and Martin are both building a toy train track out of connecting pieces. Melanie has pieces that are 8 inches long while Martin's pieces are 20 inches long. How long will the shortest track be that they can each build with the same length?

Back

40

Front

Henry and Mark are traveling around a circular track. Henry takes 7 minutes per loop, Mark takes 12 minutes per loop. If they start at the same time, in how many minutes will they meet each other again?

Back

84

Front

The least common multiple of 4 and 6 is

Back

12

Front

Least common multiple of 12 and 18

Back

36

Front

The least common multiple of 20 and 30 is

Back

60

Front

The least common multiple of 2 and 3 is

Back

6