LCM and LCD

LCM(3, 8) =

• 16

• 24

• 32

• 48

LCM(12, 8)

• 96

• 24

• 36

• 72

LCM(3, 11) =

• 25

• 66

• 14

• 33

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

• 3

• 5

• 45

• 9

What is the least common multiple (LCM) of 5 and 11? 

• 25

• 55

• 11

• 15

• 3

• 45

• 30

What is the least common denominator of 1/7 and 2/12?

• 56

• 60

• 84

• 14

What is the LCM of 2, 4, 6?

• 6

• 12

• 4

• 2

• 216
• 109
• 69
• 54

What is the least common multiple of 6 and 9?

• 3

• 18

• 36

• 54