18/42 as a percentage is 42.86%. This number tells you how much of a whole the fraction represents when you think in terms of hundreds.
If you simplify the fraction, 18/42 reduces to 3/7. Both forms show the same size of the part compared to the whole, just written in different ways.
Knowing the percentage can be handy in everyday situations—like figuring out a discount, a test score, or a share of a group. It gives a quick, easy‑to‑read picture of the proportion.
