Answers

Subtract 90/10 from 90/80

1^st number: 1 10/80, 2^nd number: 9 0/10

90/80 - 90/10 is -63/8.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 10 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 80 × 1 = 80,
   90/80 = 90 × 1/80 × 1 = 90/80
3. Likewise, for the 2nd fraction, since 10 × 8 = 80,
   90/10 = 90 × 8/10 × 8 = 720/80
4. Subtract the two like fractions:
   90/80 - 720/80 = 90 - 720/80 = -630/80
5. After reducing the fraction, the answer is -63/8

MathStep (Works offline)

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

Related: ⁹⁰/₈₀-⁹⁰/₂₀ ⁹⁰/₈₀-⁹⁰/₃₀ ⁹⁰/₈₀-⁹⁰/₅₀ ⁹⁰/₈₀-⁹⁰/₇₀

Subtract Fractions Calculator