Subtract 27/90 from 12/84
12/84 - 27/90 is -11/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
12/84 = 12 × 15/84 × 15 = 180/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
27/90 = 27 × 14/90 × 14 = 378/1260 - Subtract the two like fractions:
180/1260 - 378/1260 = 180 - 378/1260 = -198/1260 - After reducing the fraction, the answer is -11/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/84-27/90 12/84-54/90 36/84-27/90 12/84-81/90 60/84-27/90