Answers

Subtract 4/80 from 2/90

2/90 - 4/80 is -1/36.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 90 × 8 = 720,
   2/90 = 2 × 8/90 × 8 = 16/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   4/80 = 4 × 9/80 × 9 = 36/720
4. Subtract the two like fractions:
   16/720 - 36/720 = 16 - 36/720 = -20/720
5. After reducing the fraction, the answer is -1/36

MathStep (Works offline)

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

Related: ⁴/₉₀-⁴/₈₀ ²/₉₀-⁸/₈₀ ⁶/₉₀-⁴/₈₀ ²/₉₀-¹²/₈₀ ¹⁰/₉₀-⁴/₈₀ ²/₉₀-²⁰/₈₀ ¹⁴/₉₀-⁴/₈₀ ²/₉₀-²⁸/₈₀

Subtract Fractions Calculator