Answers

Subtract 80/28 from 30/81

1^st number: 30/81, 2^nd number: 2 24/28

30/81 - 80/28 is -470/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 28 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 81 × 28 = 2268,
   30/81 = 30 × 28/81 × 28 = 840/2268
3. Likewise, for the 2nd fraction, since 28 × 81 = 2268,
   80/28 = 80 × 81/28 × 81 = 6480/2268
4. Subtract the two like fractions:
   840/2268 - 6480/2268 = 840 - 6480/2268 = -5640/2268
5. After reducing the fraction, the answer is -470/189

MathStep (Works offline)

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

Related: ⁶⁰/₈₁-⁸⁰/₂₈ ³⁰/₈₁-⁸⁰/₅₆ ⁹⁰/₈₁-⁸⁰/₂₈ ³⁰/₈₁-⁸⁰/₈₄

Subtract Fractions Calculator