Fraction Addition

Equivalent Fractions

100

1/2 is equivalent to __/8

4/8

200

3/5 is equivalent to __/15

9/15

300

2/3 is equivalent to __/18

12/18

400

4/3 is equivalent to __/9

12/9

500

7/9 is equivalent to __/27

21/27

Finding Common Denominators

100

The lowest common denominator for 1/2 and 3/8 is

8

200

The lowest common denominator for 3/6 and 2/8 is

24

300

The lowest common denominator for 2/3 and 5/12 is

12

400

The lowest common denominator for 9/10 and 10/11 is 

110

500

Two possible common denominators for 3/4 and 5/6 are

12, 24, 36, 48, ...

Adding Fractions

100

3/5+1/5=

4/5

200

1/4+3/8=

5/8

300

3/5+1/4=

17/20

400

2/9+1/3=

5/9

500

1/7+1/8=

15/56

Adding with Mixed Numbers

100

1 1/2 + 1/2=

2

200

3 2/3 + 2/3=

4 1/3

300

1 2/3 + 5/6=

2 3/6 (or 2 1/2)

400

4 4/5 + 3/4=

5 8/20 (or 5 4/10)

500

3 1/4 + 2 2/3=

5 11/12