Adding & Subtracting Fractions with Unlike Denominators

Adding Fractions with Unlike Denominators

100

1/4 + 2/3 = 

11/12

200

4/9 + 1/6 =

*write your answer in simplest form 

11/18

300

3/4 + 1/9 =

31/36

400

1/2 + 1/3 =

5/6

500

1/4 + 3/7 =

19/28

Subtracting Fractions with Unlike Denominators

100

4/5 - 1/3 =

7/15

200

4/3 - 2/7 =

22/21 

300

3/4 - 1/9 =

23/36

400

6/7 - 1/2 =

5/14

500

9/10 - 1/4 =

*Write your answer in simplest form 

13/20

Least Common Denominator

100

1/2 and 3/5

LCD: 10

200

5/12 and 2/9

LCD: 36

300

1/7 and 4/8

LCD: 56

400

9/10 and 5/6

LCD: 30

500

1/4 and 2/3

LCD: 12

Equivalent Fractions

100

Are these two fractions equivalent?

1/4,   3/12

Yes

200

Are these two fractions equivalent?

1/3,   3/15

No

300

What is an equivalent fraction for    2/3?

4/6,  6/9,  8/12,  10/15

400

What is an equivalent fraction to 3/5?

6/10,  9/15,   12/20,   15/25

500

What is an equivalent fraction to 14/21

2/3,  28/42,  42/63

Estimating or Benchmarking

100

Using 0, 1/2, or 1, what is the estimate for 5/9?

1/2

200

Using 0, 1/2, or 1, what is the estimate for  1  4/5?

2

300

Using 0, 1/2, or 1, what is the estimate for  3  7/8?

4

400

Using 0, 1/2, or 1, what is the estimate for  8 1/7?

8

500

Using 0, 1/2, or 1, what is the estimate for  13  4/5?

14