Answers

Subtract 40/21 from 24/27

1^st number: 24/27, 2^nd number: 1 19/21

24/27 - 40/21 is -64/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 21 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 27 × 7 = 189,
   24/27 = 24 × 7/27 × 7 = 168/189
3. Likewise, for the 2nd fraction, since 21 × 9 = 189,
   40/21 = 40 × 9/21 × 9 = 360/189
4. Subtract the two like fractions:
   168/189 - 360/189 = 168 - 360/189 = -192/189
5. After reducing the fraction, the answer is -64/63

MathStep (Works offline)

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

Related: ⁴⁸/₂₇-⁴⁰/₂₁ ²⁴/₂₇-⁸⁰/₂₁ ²⁴/₅₄-⁴⁰/₂₁ ²⁴/₂₇-⁴⁰/₄₂ ⁷²/₂₇-⁴⁰/₂₁ ²⁴/₈₁-⁴⁰/₂₁ ²⁴/₂₇-⁴⁰/₆₃

Subtract Fractions Calculator