Math 6

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

• 32
• 12
• 8
• 24

What do you need to have when adding unlike fractions?

• common denominator
• common numerator
• common numerator and denominator

Is this a correct answer?

• Yes, the student correctly added.
• No, you cannot add unlike denominators
• No, 5 + 7 is not 12
• No, 2 + 3 is not 5

What is the least common denominator of 1/7 and 3/6?

• 14
• 21
• 7
• 42

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

• 12
• 24
• 8
• 16

What is the least common denominator of 2/6 and 7/8?

• 36
• 8
• 18
• 24

What is the least common denominator of 1/4 and 2/5?

• 5
• 25
• 10
• 20

What is the least common denominator of 2/4 and 4/7?

• 24
• 7
• 42
• 28

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

• 6
• 3
• 9
• 21

What is the least common denominator of 1/2 and 3/7?

• 2
• 14
• 7
• 28