Subtract 21/5 from 27/28
1st number: 27/28, 2nd number: 4 1/5
27/28 - 21/5 is -453/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 5 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
27/28 = 27 × 5/28 × 5 = 135/140 - Likewise, for the 2nd fraction, since 5 × 28 = 140,
21/5 = 21 × 28/5 × 28 = 588/140 - Subtract the two like fractions:
135/140 - 588/140 = 135 - 588/140 = -453/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/28-21/5 27/28-42/5 27/56-21/5 27/28-21/10 81/28-21/5 27/28-63/5 27/84-21/5 27/28-21/15 27/28-21/25 27/28-21/35