Answers

Subtract 8/27 from 8/21

8/21 - 8/27 is 16/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 27 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 21 × 9 = 189,
   8/21 = 8 × 9/21 × 9 = 72/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   8/27 = 8 × 7/27 × 7 = 56/189
4. Subtract the two like fractions:
   72/189 - 56/189 = 72 - 56/189 = 16/189

MathStep (Works offline)

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

Related: ¹⁶/₂₁-⁸/₂₇ ⁸/₂₁-¹⁶/₂₇ ⁸/₄₂-⁸/₂₇ ⁸/₂₁-⁸/₅₄ ²⁴/₂₁-⁸/₂₇ ⁸/₂₁-²⁴/₂₇ ⁸/₆₃-⁸/₂₇ ⁸/₂₁-⁸/₈₁ ⁴⁰/₂₁-⁸/₂₇ ⁸/₂₁-⁴⁰/₂₇ ⁵⁶/₂₁-⁸/₂₇ ⁸/₂₁-⁵⁶/₂₇

Subtract Fractions Calculator