Subtract 21/54 from 10/28
10/28 - 21/54 is -2/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 54 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 28 × 27 = 756,
10/28 = 10 × 27/28 × 27 = 270/756 - Likewise, for the 2nd fraction, since 54 × 14 = 756,
21/54 = 21 × 14/54 × 14 = 294/756 - Subtract the two like fractions:
270/756 - 294/756 = 270 - 294/756 = -24/756 - After reducing the fraction, the answer is -2/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/28-21/54 10/28-42/54 10/56-21/54 30/28-21/54 10/28-63/54 10/84-21/54 50/28-21/54 70/28-21/54