Subtract 18/84 from 6/90
6/90 - 18/84 is -31/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
6/90 = 6 × 14/90 × 14 = 84/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
18/84 = 18 × 15/84 × 15 = 270/1260 - Subtract the two like fractions:
84/1260 - 270/1260 = 84 - 270/1260 = -186/1260 - After reducing the fraction, the answer is -31/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/90-18/84 6/90-36/84 18/90-18/84 6/90-54/84 30/90-18/84 6/90-90/84 42/90-18/84