Answers

Subtract 40/90 from 12/40

12/40 - 40/90 is -13/90.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 90 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 40 × 9 = 360,
   12/40 = 12 × 9/40 × 9 = 108/360
3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
   40/90 = 40 × 4/90 × 4 = 160/360
4. Subtract the two like fractions:
   108/360 - 160/360 = 108 - 160/360 = -52/360
5. After reducing the fraction, the answer is -13/90

MathStep (Works offline)

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

Related: ²⁴/₄₀-⁴⁰/₉₀ ¹²/₄₀-⁸⁰/₉₀ ¹²/₈₀-⁴⁰/₉₀ ³⁶/₄₀-⁴⁰/₉₀ ⁶⁰/₄₀-⁴⁰/₉₀ ⁸⁴/₄₀-⁴⁰/₉₀

Subtract Fractions Calculator