Subtract 20/84 from 10/90
10/90 - 20/84 is -8/63.
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,
10/90 = 10 × 14/90 × 14 = 140/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
20/84 = 20 × 15/84 × 15 = 300/1260 - Subtract the two like fractions:
140/1260 - 300/1260 = 140 - 300/1260 = -160/1260 - After reducing the fraction, the answer is -8/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/90-20/84 10/90-40/84 30/90-20/84 10/90-60/84 50/90-20/84 70/90-20/84