Answers: 7. 4/50 + 30/50 = 34/50 = 17/25
8. 8/12 - 7/12 = 1/12
9. 90/100 + 2/100 = 92/100 = 23/25
10. 16/36 + 9/36 = 25/36
11. 17/15 - 5/15 = 2/15
12. 7/16 + 6/16 = 13/16
13. 8/20 + 5/20 = 13/20
14. 2/14 + 7/14 = 9/14
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