Unit fractions are fractions whose top number is 1. They represent one part out of a whole that’s been divided into equal pieces—like 1/2, 1/3, or 1/4. The key idea is that the numerator is 1, showing that only one part is counted. The denominator is the bottom number that tells how many equal parts the whole is split into, but it doesn’t determine whether the numerator is 1. Fractions with numerators other than 1, such as 2/3 or 3/5, are not unit fractions. Equivalent fractions name the same amount with different numerators and denominators (for example, 1/2 and 2/4), but they don’t specifically require the numerator to be 1. Area, on the other hand, is a measurement concept and not a type of fraction. So, the term that describes a fraction with numerator 1 is unit fraction.