Answers

Subtract 56/81 from 18/60

18/60 - 56/81 is -317/810.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 60 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 60 × 27 = 1620,
   18/60 = 18 × 27/60 × 27 = 486/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   56/81 = 56 × 20/81 × 20 = 1120/1620
4. Subtract the two like fractions:
   486/1620 - 1120/1620 = 486 - 1120/1620 = -634/1620
5. After reducing the fraction, the answer is -317/810

MathStep (Works offline)

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

Related: ³⁶/₆₀-⁵⁶/₈₁ ⁵⁴/₆₀-⁵⁶/₈₁ ⁹⁰/₆₀-⁵⁶/₈₁

Subtract Fractions Calculator