Adding and Subtracting Mixed Numbers

Front

3 1/4 + 3 5/8

Back

6 7/8

Front

9 9/10 + 2 3/5

Back

12 1/2

Front

3 5/11 + 7 2/3

Back

11 4/33

Front

5 2/8 + 2 4/10

Back

7 13/20

Front

1/2 + 1/7

Back

9/14

Front

8 9/10 - 3 2/3

Back

5 7/30

Front

7 5/12 - 2 1/2

Back

4 11/12

Front

9 1/5 - 5 4/6

Back

3 8/15

Front

Combined weight of two boxes: 6 3/8 kg and 7 2/5 kg?

Back

13 31/40

Front

5 5/6 + 5 3/4

Back

11 7/12