72/90 as a percentage is 80.00%. This rounded figure tells you how much of a whole 72 parts out of 90 represent.
The fraction 72/90 can be simplified by dividing both numbers by their greatest common divisor, which is 18. Doing that gives you 4/5, a much easier fraction to work with in everyday calculations.
Seeing the percentage and the simplified fraction side by side makes it clear that 80 % of anything is the same as four‑fifths of it. This relationship is handy for quick estimates in school projects, budgeting, or any situation where you need to compare parts of a whole.
