Answers

Subtract 40/20 from 24/81

1^st number: 24/81, 2^nd number: 2 0/20

24/81 - 40/20 is -46/27.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 20 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   24/81 = 24 × 20/81 × 20 = 480/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   40/20 = 40 × 81/20 × 81 = 3240/1620
4. Subtract the two like fractions:
   480/1620 - 3240/1620 = 480 - 3240/1620 = -2760/1620
5. After reducing the fraction, the answer is -46/27

MathStep (Works offline)

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

Related: ⁴⁸/₈₁-⁴⁰/₂₀ ²⁴/₈₁-⁸⁰/₂₀ ⁷²/₈₁-⁴⁰/₂₀ ²⁴/₈₁-⁴⁰/₆₀

Subtract Fractions Calculator