Answers

Subtract 90/27 from 20/90

1^st number: 20/90, 2^nd number: 3 9/27

20/90 - 90/27 is -28/9.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 27 is 270
   
   Next, find the equivalent fraction of both fractional numbers with denominator 270
2. For the 1st fraction, since 90 × 3 = 270,
   20/90 = 20 × 3/90 × 3 = 60/270
3. Likewise, for the 2nd fraction, since 27 × 10 = 270,
   90/27 = 90 × 10/27 × 10 = 900/270
4. Subtract the two like fractions:
   60/270 - 900/270 = 60 - 900/270 = -840/270
5. After reducing the fraction, the answer is -28/9

MathStep (Works offline)

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

Related: ⁴⁰/₉₀-⁹⁰/₂₇ ²⁰/₉₀-⁹⁰/₅₄ ⁶⁰/₉₀-⁹⁰/₂₇ ²⁰/₉₀-⁹⁰/₈₁

Subtract Fractions Calculator