A decimal number is simply a way of representing a number in such a way that the place value of a one is ten times that of a one in the place to its right. So the decimal for 1 gallon is 1. If you want it as a decimal fraction of some other quantity then you need to specify that second quantity.
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
0.5
657/100.
583.0, possibly.
1/6
It is 5/16.
0.3333 repeating
0.3 equals 3/10.
17 20ths equals 0.85