Question

Changing tree over 25 as a decimal

Answer 1

Am presuming you meant  3 /  25 as decimal

3/25    Multiply top and bottom by 4

(3 / 25) * (4/4) =  12 / 100

= 0.12

Answer 2

First divide the numerator by the donominator=
3 ÷ 25= 0.12

Hope I helped