simplify all this AND SHOW YOUR WORK

2/3 =


4/7 =

4/10 =


18/24 =

8/20 =

15/20 = 3/4

4/6 = 2/3

9/27 = 1/3

3) 3/8 + 3/8 =

4) 8/9 – 2/9 =