The simplest form of 21/3 is 7/1.
Steps to simplifying fractions
- Find the GCD (or HCF) of numerator and denominator
GCD of 21 and 3 is 3 - Divide both the numerator and denominator by the GCD
21 ÷ 3/3 ÷ 3 - Reduced fraction: 7/1
Therefore, 21/3 simplified to lowest terms is 7/1.
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Equivalent fractions: 42/6 63/9 7/1 105/15 147/21
More fractions: 42/3 21/6 63/3 21/9 22/3 21/420/3 21/2