Answers

Subtract 1/21 from 5/81

5/81 - 1/21 is 8/567.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 21 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 81 × 7 = 567,
   5/81 = 5 × 7/81 × 7 = 35/567
3. Likewise, for the 2nd fraction, since 21 × 27 = 567,
   1/21 = 1 × 27/21 × 27 = 27/567
4. Subtract the two like fractions:
   35/567 - 27/567 = 35 - 27/567 = 8/567

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ¹⁰/₈₁-¹/₂₁ ⁵/₈₁-²/₂₁ ⁵/₈₁-¹/₄₂ ¹⁵/₈₁-¹/₂₁ ⁵/₈₁-³/₂₁ ⁵/₈₁-¹/₆₃ ²⁵/₈₁-¹/₂₁ ⁵/₈₁-⁵/₂₁ ³⁵/₈₁-¹/₂₁ ⁵/₈₁-⁷/₂₁

Subtract Fractions Calculator