Answers

Subtract 27/40 from 12/84

12/84 - 27/40 is -149/280.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   12/84 = 12 × 10/84 × 10 = 120/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   27/40 = 27 × 21/40 × 21 = 567/840
4. Subtract the two like fractions:
   120/840 - 567/840 = 120 - 567/840 = -447/840
5. After reducing the fraction, the answer is -149/280

MathStep (Works offline)

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

Related: ²⁴/₈₄-²⁷/₄₀ ¹²/₈₄-⁵⁴/₄₀ ¹²/₈₄-²⁷/₈₀ ³⁶/₈₄-²⁷/₄₀ ¹²/₈₄-⁸¹/₄₀ ⁶⁰/₈₄-²⁷/₄₀

Subtract Fractions Calculator