Identify Numerator and Denominator: Step 1: Identify the numerator and denominator of the fraction. 21 has a numerator of 1 and a denominator of 2.
Check for Divisibility: Step 2: Check if the numerator can be divided evenly by any number other than 1 and itself.Since 1 is only divisible by 1, and it doesn't share any common factors with 2 other than 1, it's already in the lowest terms.
More problems from Write fractions in lowest terms