Answers

Subtract 42/24 from 90/80

1^st number: 1 10/80, 2^nd number: 1 18/24

90/80 - 42/24 is -5/8.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 24 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 80 × 3 = 240,
   90/80 = 90 × 3/80 × 3 = 270/240
3. Likewise, for the 2nd fraction, since 24 × 10 = 240,
   42/24 = 42 × 10/24 × 10 = 420/240
4. Subtract the two like fractions:
   270/240 - 420/240 = 270 - 420/240 = -150/240
5. After reducing the fraction, the answer is -5/8

MathStep (Works offline)

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

Related: ⁹⁰/₈₀-⁸⁴/₂₄ ⁹⁰/₈₀-⁴²/₄₈ ⁹⁰/₈₀-⁴²/₇₂

Subtract Fractions Calculator