Answers

Subtract 10/80 from 7/81

7/81 - 10/80 is -25/648.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 80 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 81 × 80 = 6480,
   7/81 = 7 × 80/81 × 80 = 560/6480
3. Likewise, for the 2nd fraction, since 80 × 81 = 6480,
   10/80 = 10 × 81/80 × 81 = 810/6480
4. Subtract the two like fractions:
   560/6480 - 810/6480 = 560 - 810/6480 = -250/6480
5. After reducing the fraction, the answer is -25/648

MathStep (Works offline)

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

Related: ¹⁴/₈₁-¹⁰/₈₀ ⁷/₈₁-²⁰/₈₀ ²¹/₈₁-¹⁰/₈₀ ⁷/₈₁-³⁰/₈₀ ³⁵/₈₁-¹⁰/₈₀ ⁷/₈₁-⁵⁰/₈₀ ⁴⁹/₈₁-¹⁰/₈₀ ⁷/₈₁-⁷⁰/₈₀

Subtract Fractions Calculator