Answers

Subtract 8/27 from 10/42

10/42 - 8/27 is -11/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 27 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 42 × 9 = 378,
   10/42 = 10 × 9/42 × 9 = 90/378
3. Likewise, for the 2nd fraction, since 27 × 14 = 378,
   8/27 = 8 × 14/27 × 14 = 112/378
4. Subtract the two like fractions:
   90/378 - 112/378 = 90 - 112/378 = -22/378
5. After reducing the fraction, the answer is -11/189

MathStep (Works offline)

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

Related: ²⁰/₄₂-⁸/₂₇ ¹⁰/₄₂-¹⁶/₂₇ ¹⁰/₈₄-⁸/₂₇ ¹⁰/₄₂-⁸/₅₄ ³⁰/₄₂-⁸/₂₇ ¹⁰/₄₂-²⁴/₂₇ ¹⁰/₄₂-⁸/₈₁ ⁵⁰/₄₂-⁸/₂₇ ¹⁰/₄₂-⁴⁰/₂₇ ⁷⁰/₄₂-⁸/₂₇ ¹⁰/₄₂-⁵⁶/₂₇

Subtract Fractions Calculator