45/53 as a percentage is 84.91%. This value tells you how much of a whole 45 parts out of 53 represent when you look at it on a scale of 100.
In everyday terms, saying something is 84.91% means it is just a little short of being completely whole. If you imagined a pizza cut into 53 equal slices, taking 45 slices would give you about 84.91% of the pizza.
Remember that percentages are a handy way to compare parts of any total, no matter how big or small that total might be. Using the fraction 45/53 and its percentage makes it easy to see the size of the portion at a glance.