Adding & Subtracting Fractions

Finding the Least Common Denominator (LCD)

100

2/3 and 1/6

6

200

2/7 and 3/21

21

300

5/6 and 4/5

30

400

2/7 and 5/8

56

500

5/12 and 5/7

84

Add./Sub. with Similar Fractions

100

1/2 + 1/4 =

3/4

200

2/5 + 3/10 =

7/10

300

5/6 - 2/3 =

1/6

400

11/12 - 5/6 =

1/12

500

3/4 - 5/16 =

7/16

Addition with Unlike Fractions

100

1/2 + 1/3 =

5/6

200

1/2 + 2/5 =

9/10

300

1/8 + 3/5 =

29/40

400

5/9 + 1/4 =

29/36

500

1/2 + 2/13 =

17/26

Subtraction with Unlike Fractions

100

1/2 - 2/7 =

3/14

200

3/7 - 1/3 =

2/21

300

10/11 - 1/2 =

9/22

400

5/9 - 1/4 =

11/36

500

6/13 - 1/3 =

5/39

Add./Sub. with Unlike Fractions (Challenging!)

100

2/9 + 1/12 =

33/108

200

5/8 - 3/11 =

31/88

300

3/7 + 1/20 =

67/140

400

5/7 + 3/13 =

86/91

500

6/17 - 2/7 =

8/119