Adding and Subtracting Rational Fractions

+ unlike denominators

100

-2/5 + 17/20

9/20

200

-1/12 - (-3/4)

2/3

300

-7/8 - (-3/16)

-11/16

400

-2/12 - (-3/36)

-1/12

500

-10/225 + 3/5

5/9

- unlike denominators

100

-1/6 - 2/3

-5/6

200

1/2 - 4/5

-3/10

300

-4/5 + (-1/3)

-1 and 2/15

400

-7/10 - 2/15

-5/6

500

-13/20 - 2/5

-1 and 1/20

+ mixed numbers

100

-6  14/15 + 5  1/5

-1  11/15

200

-1  2/3 + 4   2/14

2  10/21

300

4  2/55 - (-5  10/11)

9  52/55

400

-2  11/58 + 4  5/29

1   57/58

500

2  12/27 -  (-6  2/9)

8  2/3

- mixed numbers

100

7  3/9 - 2  3/15

5  2/15

200

-8  3/13 - 1  1/26

-9  7/26

300

9  7/25 - 1  3/50

8  11/50

400

-7 and 1/4 - 3 and 10/44

-10  21/44

500

8  2/28 - 1  1/14

7

Any

100

6/42 - 2/7

-1/7

200

-1  3/4 + 3/72

-1  17/24

300

5/12 + (-3/24)

7/24

400

8/9 - 12/63

44/63

500

-1  1/2 - 3/18

-1  2/3