The simplest form of 3/21 is 1/7.
Steps to simplifying fractions
- Find the GCD (or HCF) of numerator and denominator
GCD of 3 and 21 is 3 - Divide both the numerator and denominator by the GCD
3 ÷ 3/21 ÷ 3 - Reduced fraction: 1/7
Therefore, 3/21 simplified to lowest terms is 1/7.
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Equivalent fractions: 6/42 9/63 1/7 15/105 21/147
More fractions: 6/21 3/42 9/21 3/63 4/21 3/222/21 3/20