20/42 as a percentage is 47.62%. This number tells you that the fraction is just under half of a whole.
The fraction 20/42 can be reduced by dividing both top and bottom by 2, giving 10/21. Even though the numbers are smaller, the value stays the same, so 10/21 is also 47.62% when written as a percent.
In everyday life you might see this kind of fraction when sharing something like a pizza or a budget. Saying it’s about 48 % is a quick way to understand that it’s almost half, but not quite. The rounded figure is useful for simple calculations or when you need an easy‑to‑read number.
