Subtract 15/90 from 2/28
2/28 - 15/90 is -2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
2/28 = 2 × 45/28 × 45 = 90/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
15/90 = 15 × 14/90 × 14 = 210/1260 - Subtract the two like fractions:
90/1260 - 210/1260 = 90 - 210/1260 = -120/1260 - After reducing the fraction, the answer is -2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/28-15/90 2/28-30/90 2/56-15/90 6/28-15/90 2/28-45/90 2/84-15/90 10/28-15/90 2/28-75/90 14/28-15/90