The fraction 9/21 is 42.86% when expressed as a percentage. This tells you that 9 parts out of 21 are a little less than half of the whole.
If you simplify 9/21, you get 3/7, which is still the same value. Seeing it as a percentage makes it easy to compare with other numbers, like test scores or discounts, because most people think in terms of percent.
In everyday use, you might hear someone say “about 43%” to describe 9/21, rounding the number a bit. Whether you work with fractions or percentages, the idea is the same: 9 out of 21 represents roughly four‑tenths of the total.
