Answers

Subtract 90/20 from 2/45

1^st number: 2/45, 2^nd number: 4 10/20

2/45 - 90/20 is -401/90.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 20 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 45 × 4 = 180,
   2/45 = 2 × 4/45 × 4 = 8/180
3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
   90/20 = 90 × 9/20 × 9 = 810/180
4. Subtract the two like fractions:
   8/180 - 810/180 = 8 - 810/180 = -802/180
5. After reducing the fraction, the answer is -401/90

MathStep (Works offline)

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

Related: ⁴/₄₅-⁹⁰/₂₀ ²/₉₀-⁹⁰/₂₀ ²/₄₅-⁹⁰/₄₀ ⁶/₄₅-⁹⁰/₂₀ ²/₄₅-⁹⁰/₆₀ ¹⁰/₄₅-⁹⁰/₂₀ ¹⁴/₄₅-⁹⁰/₂₀

Subtract Fractions Calculator