can someone check this for me

Question

11)Subtract

5/6 -3/5

My answer: .23

12)Add

1/3 + 1/5 + 1/10

My answer:.63

13) Divide .write each result in simplest form:
8/9 (divided by) 11/15

My answer: 1 and 1/20

5/6-3/5 is like saying:
25/30-18/30
= 7/30