Answers

Subtract 42/27 from 81/20

1^st number: 4 1/20, 2^nd number: 1 15/27

81/20 - 42/27 is 449/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 27 is 540
   
   Next, find the equivalent fraction of both fractional numbers with denominator 540
2. For the 1st fraction, since 20 × 27 = 540,
   81/20 = 81 × 27/20 × 27 = 2187/540
3. Likewise, for the 2nd fraction, since 27 × 20 = 540,
   42/27 = 42 × 20/27 × 20 = 840/540
4. Subtract the two like fractions:
   2187/540 - 840/540 = 2187 - 840/540 = 1347/540
5. After reducing the fraction, the answer is 449/180
6. In mixed form: 289/180

MathStep (Works offline)

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

Related: ⁸¹/₂₀-⁸⁴/₂₇ ⁸¹/₄₀-⁴²/₂₇ ⁸¹/₂₀-⁴²/₅₄ ⁸¹/₆₀-⁴²/₂₇ ⁸¹/₂₀-⁴²/₈₁

Subtract Fractions Calculator