Divide the fraction 13/15 13 divided by 15 equals 0.87
The fractional representation of 1 gallon is 1 gallon. If you want it as a decimal fraction of some other quantity then you need to specify that second quantity.
.05555555555 as a fraction equals 5555555555/100000000000
657/100.
0.5
583.0, possibly.
It is 5/16.
1/6
0.3333 repeating
0.3 equals 3/10.
17 20ths equals 0.85
Just like an ordinary fraction - divide the numerator (top) by the denominator (bottom).