Answers

Subtract 70/81 from 27/80

27/80 - 70/81 is -3413/6480.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 81 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 80 × 81 = 6480,
   27/80 = 27 × 81/80 × 81 = 2187/6480
3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
   70/81 = 70 × 80/81 × 80 = 5600/6480
4. Subtract the two like fractions:
   2187/6480 - 5600/6480 = 2187 - 5600/6480 = -3413/6480

MathStep (Works offline)

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

Related: ⁵⁴/₈₀-⁷⁰/₈₁ ⁸¹/₈₀-⁷⁰/₈₁

Subtract Fractions Calculator