GCF and LCM

What is the least common denominator of 1/9 and 2/3?

• 6
• 3
• 9
• 21

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8

• 32
• 12
• 8
• 24

Find the lowest common denominator of these fractions: 2/7 and 2/21

• 7

• 21

• 18

• 147

• 7

• 4

• 28

• 56

• 15

• 3

• 45

• 30

• 12

• 10

• 120

• 60

What is the least common denominator of 6/8 and 4/12?

• 12
• 24
• 8
• 16