Answers

Subtract 8/81 from 28/20

1^st number: 1 8/20, 2^nd number: 8/81

28/20 - 8/81 is 527/405.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   28/20 = 28 × 81/20 × 81 = 2268/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   8/81 = 8 × 20/81 × 20 = 160/1620
4. Subtract the two like fractions:
   2268/1620 - 160/1620 = 2268 - 160/1620 = 2108/1620
5. After reducing the fraction, the answer is 527/405
6. In mixed form: 1122/405

MathStep (Works offline)

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

Related: ⁵⁶/₂₀-⁸/₈₁ ²⁸/₂₀-¹⁶/₈₁ ²⁸/₄₀-⁸/₈₁ ⁸⁴/₂₀-⁸/₈₁ ²⁸/₂₀-²⁴/₈₁ ²⁸/₆₀-⁸/₈₁ ²⁸/₂₀-⁴⁰/₈₁ ²⁸/₂₀-⁵⁶/₈₁

Subtract Fractions Calculator