Answer:

8. 7/15

9. 25/12

10. 39/20

Step-by-step explanation:

8. 2/3 - 1/5

= 5(2) - 3(1)

15

= (10-3)/15

= 7/15

9. 2 5/6 - 3/4

= 17/6 - 3/4

= 4(17) - 6(3)

24

= (68-18)/24

= 50/24 (2/2) ; to get the lowest term

= 25/12

10. 3 2/10 - 1 1/4

= 32/10 - 5/4

= 4(32) - 10(5)

40

= (128-50)/40

= 78/40 (2/2) ; to get the lowest term

= 39/20