18/51 as a percentage is 35.29%. This value tells you how much of a whole the fraction represents when you think in terms of hundredths. It’s a quick way to see that the fraction is a little over one‑third.
The fraction 18/51 can be reduced to 6/17, which is the same size but uses smaller numbers. Even though the numbers change, the amount stays the same, so the percentage stays 35.29%.
Knowing the percentage helps when you compare it to other numbers, like 30% or 40%, without having to work with the original fraction. It’s a handy shortcut for everyday calculations.