LCM

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

LCM of 7 and 4

• 12

• 32

• 56

• 28

John works every 4 days.  Chris works every 7 days.  How many days until they work together again?

• 28

• 11

• 3

• 35

Find the least common multiple (LCM) of 4 and 6.

• 4

• 6

• 12

• 24

What is the Least Common Multiple of 4 and 14

• 28

• 42

• 56

• 24

Least common multiple of 3 and 9? 

• 9

• 3

• 27

• 18 

Find the Least Common Multiple for the set of numbers below.

4, 10

The Multiples of 4 are: 4, 8, 12, 16, __

The Multiples of 10 are: 10, __, 30, 40

• 4

• 10

• 20

• 40

Find the Least Common Multiple for the set of numbers below.

8, 10

• 10

• 20

• 30

• 40

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

• 50

• 40

• 5

• 8