Answer:

2/10 + 3/10 in simplest form

6/8 - 2/8 in simplest form

5/5 + 5/5 + 3/5 in simplest form

12/12 + 12/12 + 5/12 in simplest form

1/2

1/2

2 3/5

2 5/12

explanation

2/10 + 3/10 = 5/10 or 1/2 in lowest form

6/8 - 2/8 = 4/8 or 1/2

5/5 + 5/5 + 3/5 = 13/5 or 2 3/5 in mixed fraction

12/12 + 12/12 + 5/12 = 29/12 or 2 5/12 in mixed

you can use calculator if you have any doubt:)