Operations with Fractions

Adding and Subtracting Fractions

100

3/11 - 3/22

3/22

200

7/10 - 1/4

18/40 or 9/20

300

7/8 - 2/3

5/24

400

4/5 + 9/10

1 7/10

500

In one day, I spent 1/4 hour running, 1/10 hour eating beef, and 1/2 hour eating tuna.  How much time did these activities take altogether?

17/20 hour or 51 min

Adding and Subtracting Mixed Numbers

100

9 7/8 - 4 1/4

5 5/8

200

9 5/6 - 6 1/3

3 1/2

300

7 1/4 - 3 2/3

3 7/12

400

4 2/3 + 3 7/8

8 13/24

500

76 - 73 3/5

2 2/5

Multiplying Fractions

100

3 2/9 * 1/2

1 11/18

200

5 2/3 * 7/12

3 11/36

300

3 1/3 * 2 5/6

9 4/9

400

4 1/5 * 5 1/12

21 7 /20

500

I am 2 1/9 times as old as Matt. If Matt is 18 years old, how old am I?

38 years old

Dividing Fractions

100

7/8 divide 5/6

1 1/20

200

2/3 divide 2/5

1 2/3

300

5 7/8 divide 5/6

7 1/20

400

2 5/6 divide 4 1/3

17/26

500

Each burger weighs 5/8 kg.  If I bought 5 kg of beef, how many burgers could I make? 

8 burgers

LCM

100

5

7

35

200

3

5

6

30

300

4

5

20

400

2

12

12

500

18

24

36

72