Answers

Subtract 90/20 from 15/75

1^st number: 15/75, 2^nd number: 4 10/20

15/75 - 90/20 is -43/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 20 is 300
   
   Next, find the equivalent fraction of both fractional numbers with denominator 300
2. For the 1st fraction, since 75 × 4 = 300,
   15/75 = 15 × 4/75 × 4 = 60/300
3. Likewise, for the 2nd fraction, since 20 × 15 = 300,
   90/20 = 90 × 15/20 × 15 = 1350/300
4. Subtract the two like fractions:
   60/300 - 1350/300 = 60 - 1350/300 = -1290/300
5. After reducing the fraction, the answer is -43/10

MathStep (Works offline)

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

Related: ³⁰/₇₅-⁹⁰/₂₀ ¹⁵/₇₅-⁹⁰/₄₀ ⁴⁵/₇₅-⁹⁰/₂₀ ¹⁵/₇₅-⁹⁰/₆₀

Subtract Fractions Calculator