Subtract 28/27 from 21/25
1st number: 21/25, 2nd number: 1 1/27
21/25 - 28/27 is -133/675.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 27 is 675
Next, find the equivalent fraction of both fractional numbers with denominator 675 - For the 1st fraction, since 25 × 27 = 675,
21/25 = 21 × 27/25 × 27 = 567/675 - Likewise, for the 2nd fraction, since 27 × 25 = 675,
28/27 = 28 × 25/27 × 25 = 700/675 - Subtract the two like fractions:
567/675 - 700/675 = 567 - 700/675 = -133/675
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25-28/27 21/25-56/27 21/50-28/27 21/25-28/54 63/25-28/27 21/25-84/27 21/75-28/27 21/25-28/81