Subtract 35/28 from 1/21
1st number: 1/21, 2nd number: 1 7/28
1/21 - 35/28 is -101/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
35/28 = 35 × 3/28 × 3 = 105/84 - Subtract the two like fractions:
4/84 - 105/84 = 4 - 105/84 = -101/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-35/28 1/21-70/28 1/42-35/28 1/21-35/56 3/21-35/28 1/63-35/28 1/21-35/84 5/21-35/28 7/21-35/28