easy the answer is add.
No.
653/100
Yes.
4/10
47\50
The answer is 25/110 or 1/4.
0.2 expressed as a fration is 1/5
7/10 is tthe fration
3.89 as a fration is 3 89/100
10 times 2/5
236 is an integer and so there is no sensible way of writing it as an improper fraction.