9/18 = 50%
A fraction like 9/18, or 50%, shows up whenever something is split evenly into two parts. For example, you might finish half of a 18-question assignment, use half a tank of gas, or have 9 red candies out of 18 total candies.
You can picture 9/18 quickly as one of two equal groups being filled. Since the numerator is half of the denominator, estimate it as halfway, or 50%, rather than thinking of it as a complicated fraction.
A common mistake is assuming that 9/18 is less than 50% because both numbers look large or different. The fraction represents half only when the two parts are equal in size, so the total must be divided into 18 equal pieces and 9 of those pieces are being considered.
