Subtract 90/28 from 21/10
1st number: 2 1/10, 2nd number: 3 6/28
21/10 - 90/28 is -39/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 10 × 14 = 140,
21/10 = 21 × 14/10 × 14 = 294/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
90/28 = 90 × 5/28 × 5 = 450/140 - Subtract the two like fractions:
294/140 - 450/140 = 294 - 450/140 = -156/140 - After reducing the fraction, the answer is -39/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-90/28 21/20-90/28 21/10-90/56 63/10-90/28 21/30-90/28 21/10-90/84 21/50-90/28 21/70-90/28