51/88 as a percentage is 57.95%. This number tells us that the fraction is a little more than half of a whole.
When you see 57.95%, you can think of it as 57 out of every 100 parts. In everyday terms, if you had 100 pieces of candy and you took 57 of them, you'd have about the same amount as 51 out of 88 pieces.
The figure is rounded to two decimal places, so the exact value might be a tiny bit higher or lower, but for most practical uses 57.95% is accurate enough. This makes it easy to compare the fraction with other percentages you might encounter.