Subtract 21/28 from 10/90
10/90 - 21/28 is -23/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 28 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 28 × 45 = 1260,
21/28 = 21 × 45/28 × 45 = 945/1260 - Subtract the two like fractions:
140/1260 - 945/1260 = 140 - 945/1260 = -805/1260 - After reducing the fraction, the answer is -23/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/90-21/28 10/90-42/28 10/90-21/56 30/90-21/28 10/90-63/28 10/90-21/84 50/90-21/28 70/90-21/28