Subtract 25/28 from 2/21
2/21 - 25/28 is -67/84.
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,
2/21 = 2 × 4/21 × 4 = 8/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
25/28 = 25 × 3/28 × 3 = 75/84 - Subtract the two like fractions:
8/84 - 75/84 = 8 - 75/84 = -67/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-25/28 2/21-50/28 2/42-25/28 2/21-25/56 6/21-25/28 2/21-75/28 2/63-25/28 2/21-25/84 10/21-25/28 14/21-25/28