It is: 2/5 = 6/15
Just divide 2 by 5 on any calculator.
Assuming that fiths is your fail at spelling fifths, it is 0.08
0.4
It is: 4.4
8 fiths equals 8/5, or 1.6
12/25 is equal to 0.48
4/5 is equivalent to 8/10 or 0.8 as a decimal
7/10
0.4
Assuming that one fiths is your strange way of writing one fifths, the answer is nineteen twentieths.
There is no such word as "fiths".