Patterns Adding and Subtracting Fractions

A plumber is fitting a water pipe that is 3/4 foot long on to a water pipe that is 2/12 foot long. How long will the finished pipe be?

• 11/12 foot

• 8/16 foot

• 2/12 foot

• 1 foot

Robert made a fruit salad with 11/12 of a pound of melon and 1/6 of a pound of berries. How many pounds of fruit did Robert use in all?

• 1 1/12

• 3/4

• 2/3

• 1 1/2

6  1/4  -  2  3/4 

• 3   1/2

• 3  3/4

• 4  1/2

• 4   1/4

10  3/4
-7  1/4
________

• 3  1/4

• 4  1/2

• 3  1/2

• 18

9  5/9
- 6  5/6
________

• 3  13/18

• 3  10/18

• 2  13/18

• 2  1/2

What is the sum of these fractions?

• 4/5

• 3/20

• 17/20

• 4/20

3/7+2/21

• 13/21

• 6/8

• 11/21

• 17/30

3/7 - 1/8

• 17/56

• 13/21

• 5/12

• 4/13

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

• 1/12
• 1
• 2/35
• 23/25