Subtract 21/18 from 54/28
1st number: 1 26/28, 2nd number: 1 3/18
54/28 - 21/18 is 16/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
54/28 = 54 × 9/28 × 9 = 486/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
21/18 = 21 × 14/18 × 14 = 294/252 - Subtract the two like fractions:
486/252 - 294/252 = 486 - 294/252 = 192/252 - After reducing the fraction, the answer is 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/28-42/18 54/56-21/18 54/28-21/36 54/28-63/18 54/84-21/18 54/28-21/54 54/28-21/90