Subtract 54/28 from 7/21
1st number: 7/21, 2nd number: 1 26/28
7/21 - 54/28 is -67/42.
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,
7/21 = 7 × 4/21 × 4 = 28/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
54/28 = 54 × 3/28 × 3 = 162/84 - Subtract the two like fractions:
28/84 - 162/84 = 28 - 162/84 = -134/84 - After reducing the fraction, the answer is -67/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-54/28 7/42-54/28 7/21-54/56 7/63-54/28 7/21-54/84 35/21-54/28 49/21-54/28