16/39 as a percentage is 41.03%. This rounded value gives a quick way to understand the size of the fraction without dealing with a complicated denominator.
The fraction 16/39 cannot be reduced further, so it stays as it is. It sits a little less than halfway between 0 and 1, which matches the idea of being a little over 40 % when you look at it on a scale from 0 % to 100 %.
In everyday situations, you might use the 41.03 % figure to estimate portions, probabilities, or success rates. Rounding to two decimal places keeps the number simple enough for most reports while still being fairly accurate.