Subtract 90/84 from 15/90
1st number: 15/90, 2nd number: 1 6/84
15/90 - 90/84 is -19/21.
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,
15/90 = 15 × 14/90 × 14 = 210/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
90/84 = 90 × 15/84 × 15 = 1350/1260 - Subtract the two like fractions:
210/1260 - 1350/1260 = 210 - 1350/1260 = -1140/1260 - After reducing the fraction, the answer is -19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/90-90/84 45/90-90/84 75/90-90/84