Me
find a common denominator for each pair of fractions.
1.(done)

2. 4/5 and 2/3
3. 3/4 and 5/6
4. 7/8 and 3/10

5.(done)

6. 1/9 and 1/2
7. 2/3 and 1/8
8. 7/20 and 4/15
9. 2/5 and 3/4
10. 5/8 and 4/9
11. 1/4 and 4/7
12. 5/12 and 7/9
13. 7/15 and 1/3
14. 1/2 and 2/3
15. 2/9 and 4/5
16. 7/8 and 5/6

2) 15  3) 12  4) 40  6) 18  7) 24  8) 60  9) 20  10) 72  11) 28  12) 36  13) 15  14) 6  15) 45  16) 24

Step-by-step explanation:

2)   5 and 3 can both go into 15.  4/5 = 12/15   2/3 = 10/15

3)   4 and 6 can both go into 12.  3/4 = 9/12   5/6 = 10/12

4)   8 and 10 can both go into 40.  7/8 = 35/40   3/10 = 12/40

6)   9 and 2 can both go into 18.   1/9 = 2/18   1/2 = 9/18

7)   3 and 8 can both go into 24.   2/3 = 16/24   1/8 = 3/24

8)   20 and 15 can both go into 60.   7/20 = 21/60   4/15 = 16/60

9)   5 and 4 can both go into 20.   2/5 = 8/20   3/4 = 15/20

10)   8 and 9 can both go into 72.  5/8 = 45/72   4/9 = 32/72

11)   4 and 7 can both go into 28.   1/4 = 7/28   4/7 = 16/28

12)   12 and 9 can both go into 36.   5/12 = 15/36   7/9 = 28/36

13)   15 and 3 can both go into 15.   7/15 = 7/15   1/3 = 5/15

14)   2 and 3 can both go into 6.  1/2 = 3/6   2/3 = 4/6

15)   9 and 5 can both go into 45.  2/9 = 10/45   4/5 = 36/45

16)   8 and 6 can both go into 24.  7/8 = 21/24   5/6 = 20/24

after simplifying it i got: -36.25 as my answer. hope that !