12/68 as a percentage is 17.65%. This number tells you how much of a whole 12 parts out of 68 represent when you look at it on a scale of 100.
The fraction 12/68 can be simplified to 3/17, which is still the same proportion. Whether you write it as a fraction or a percentage, the size of the part doesn’t change—it’s just a different way to show the same amount.
In everyday terms, 17.65% means that out of every 100 items, about 18 would be the part you have. It’s a handy way to compare parts of a whole without having to work with the original numbers.