Add/Subtract Fractions

Which statement below best represents 3/7 - 5/14?

• Subtract the numerators first, then subtract the denominators

• Write an equivalent fraction for 3/7 with 14 as the new denominator. Subtract only the numerators.

• Write equivalent fractions for both fractions with 28 as the denominator. Then subtract the numerators and denominators separately.

• Write an equivalent fraction for 2/3 with 7 as the new denominator. Then subtract only the numerators.

Sarah wrote the following problem on the board:

1/5 + 4/12

What is the least common denominator you could use to solve Sarah's problem?

• 24

• 5

• 12

• 60

Anna practices the piano for 4/6 hours after school and Aaron practices for 1/2 hour. Which equation could be used to find out how many more hours Jocelyn practices than Camryn?

• 4/6 - 3/6 = 1/6

• 4/6 - 1/2 = 3/4

• 4/6 - 1/6 = 3/6

• 4/6 + 3/6 = 7/6

Susan is making trail mix. She uses 1/7 pounds of peanuts and 2/3 pounds of M&M's. What is the common denominator Susan could use to find out how many peanuts & M&M's Susan uses in her trail mix?

• 7

• 21

• 14

• 12

Susan is making trail mix. She uses 1/7 pounds of peanuts and 2/3 pounds of M&M's. How many peanuts and M&M's does Susan put in her trail mix?

• 3/10

• 3/21

• 17/21

• 11/21

1/8 + 2/6

• 3/48

• 3/14

• 11/24

• 5/24

Mary jogs for 2/4 miles and walks for 1/5 mile. How much farther does Mary jog than she walks?

• 1/2

• 3/9

• 14/20

• 6/20

4/5 - 1/3

• 3/5

• 17/15

• 7/15

• 5/8

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators

Tags

CCSS.4.NF.A.2

CCSS.4.NF.C.5

What number could be a common denominator for these two fractions?
2/3   and   3/4

• 3

• 4

• 7

• 12

Tags

CCSS.4.NF.A.2