Adding and Subtracting Fractions with Unlike Denominators

Estimating

100

Estimate the number.   6/7 is about ....

a) 0

B) 1/2

C) 1

C) 1

200

Estimate the number. 2 1/5 is about ...

a) 2

B) 2 1/2

C) 3

a) 2

300

Estimate the answer. 1/2 + 7/8 = 

1/2 + 1 = 

1 1/2

400

Estimate the answer. 1/9 + 5/6 = 

0+1 = 1

500

Estimate the answer. 2 1/9 + 1 5/12 = 

2+ 1 1/2 = 3 1/2

Common Denominator

100

What's the common denominator?

1/4 +  3/8

8

200

What's the common denominator?

3/7 - 1/5

35

300

What's the common denominator?

1/2 + 1/4 + 2/6

24

400

What's the common denominator?

2 1/9 -  1 1/3

9

500

What's the common denominator?

7 1/6 +  5 1/9  +  2 1/3

18

Rewrite the Fractions

100

Rewrite the fractions so they have a common denominator.

2/3 + 1 / 6

4/6 + 1/6

200

Rewrite the fractions so they have a common denominator.

1/5 + 7/15

3/15 + 7/15

300

Rewrite the fractions so they have a common denominator.

1/4 + 2/3

3/12 + 8/12

400

Rewrite the fractions so they have a common denominator.

2 1/3 -   1 2/9

2 3/9 - 1 2/9

500

Rewrite the fractions so they have a common denominator.

1/7 + 1/10

10/70 + 7/70

Rewrite by "Regrouping" or "Borrowing"

100

Regroup and rewrite the first fraction in order to solve.

2 1/3  - 2/3

1 4/3 - 2/3 = 1 2/3

200

Regroup and rewrite the first fraction in order to solve.

4 2/6  - 5/6

3 8/6 - 5/6 = 3 3/6

300

Rewrite this fraction so that it's fraction piece is not improper.

2 9/8

3 1/8

400

Rewrite this fraction so that it's fraction piece is not improper.

4 7/5

5 2/5

500

Solve

1 5/6 + 4 3/6

5 8/6 = 6 2/6

Solve

100

1/8 +3/4 = 

7/8

200

1/8 + 1/2 = 

5/8

300

1/8 + 15/16 =

1  1/16

400

3  3/4  -  7/8

2  7/8

500

7 5/8 + 9 2/3 + 10 3/4 = 

28 1/4