Common Denominators

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

• 32
• 12
• 8
• 24

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

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the least common denominator you could use to subtract 1/3 and 1/4?

• 3
• 4
• 24
• 12

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What would be the common denominator for adding 1/2 + 3/4?

• 6

• 4

• 9

• 2

Which fraction renames 3/4 with a denominator of 12?

• 3/12

• 4/12

• 12/12

• 9/12

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Which of the following would be the new fractions for finding common denominators for 3/4 and 2/6?

• 9/12 and 4/12

• 6/8 and 4/12

• 9/12 and 6/18

• 2/12 and 6/12