Adding and Subtracting Fractions

Adding Fractions With Like Denominators

100

4/8 + 1/8

5/8

200

5/8 + 2/8

7/8

300

8/12 + 5/12

13/12 1 1/12

400

15/16 + 11/16

26/16 or 1 5/8

500

9/16 + 15/16

24/16 or 1 1/2

Subtracting Fractions With Like Denominators

100

3/4 - 2/4

1/4

200

 12/13 - 9/13

3/13

300

24/36 - 15/36

9/36

400

34/40 - 19/40 

15/40

500

67/90 - 49/90

18/90 or 6/15

Adding Fractions With Unlike Denominators

100

2/3 + 1/4

11/12

200

2/3 + 1/2

7/6 or 1 1/6

300

1/2 + 3/4

1 1/4 or 5/4

400

5/12 + 2/3

13/12 or 1 1/12

500

3/4 + 2/3

17/12 or 1 5/12

Subtracting Fractions With Unlike Denominators

100

2/3 - 1/2

1/6

200

8/12 - 1/4 

5/12

300

5/6 - 2/3

1/6

400

18/24 - 1/2 

6/24 or 1/4

500

45/60 - 1/3

25/60

Sentence Questions

100

What is the first step in adding fractions with unlike denominators?

Find the least common denominator.

200

What is the first step in subtracting fractions with unlike denominators?

Find the least common denominator.

300

What is the least common denominator for 4 and 6?

12

400

What is the least common denominator for 7 and 5?

35

500

Jamal had 4/8 of a cake, he bought 7/10 of a pie. His friend, Dontavius, ate 22/40 of the dessert. How much of the leftovers are left?

26/40