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find the sum
find the difference
write the mixed number as a fraction
write the fraction as a mixed number
use the associative property
100

4/15 + 8/15

12/15

100

6/10 - 4/10

2/10

100

45/9

5

100

1 1/9

10/9

100

3 5/6 + 2 1/6 + 5 4/6

11 4/6

200

2/10 + 7/10

9/10

200

4/5 - 3/5

1/5

200

17/5

3 2/5

200

5 7/8

47/8

200

8 3/5 + 5 1/5 + 2 2/5

16 1/5

300

2 4/9 + 4 7/9

7 2/9

300

2 5/15 - 1 6/15

14/15

300

24/9

2 6/9

300

3 3/7

24/7

300

6 1/4 + 4 3/4 + 2 2/4

12 2/4

400

4 5/8 + 6 3/8

11

400

4 5/9 - 1 3/9

3 2/9

400

38/4

9 2/4

400

4 2/7

30/7

400

9 3/8 + 2 5/8 + 6 1/8

18 1/8

500

7 2/3 + 5 2/3

13 1/3

500

8 1/5 - 3 4/5

4 2/5

500

12/7

1 5/7

500

3 1/6

19/6

500

4 5/7 + 2 2/7 + 1 1/7

8 1/7