Subtract 81/28 from 1/5
1st number: 1/5, 2nd number: 2 25/28
1/5 - 81/28 is -377/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 5 × 28 = 140,
1/5 = 1 × 28/5 × 28 = 28/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
81/28 = 81 × 5/28 × 5 = 405/140 - Subtract the two like fractions:
28/140 - 405/140 = 28 - 405/140 = -377/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-81/28 1/10-81/28 1/5-81/56 3/5-81/28 1/15-81/28 1/5-81/84 1/25-81/28 7/5-81/28 1/35-81/28