18/36 = 50%
A fraction like 18/36, or 50%, shows up whenever something is split into two equal parts. For example, half of a pizza, half of a class choosing one option, or half of a sale price can all be described this way.
You can picture 18/36 quickly by imagining a group divided into 36 equal pieces, with 18 of them shaded. Since 18 is half of 36, you can estimate it as one-half without needing to think very long.
A common mistake is assuming that 18/36 is less than one-half just because the numbers look different. The numerator and denominator should be compared as a pair, and in this case the top number represents exactly half of the bottom number.
