GFC and LCM

• 45

• 9

• 5

• 90

• 4

• 40

• 20

• 5

• 6

• 9

• 54

• 18

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

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

Find the least common multiple of 8 and 12

• 16

• 20

• 35

• 24

Find the least common multiple of 16 and 24

• 36

• 46

• 48

• 24

Find the least common multiple of 13 and 39

• 52

• 39

• 45

• 24

LCM stands for

• least common denominator

• least common multiple

• common factor

• factor tree