Subtract 81/35 from 81/28
1st number: 2 25/28, 2nd number: 2 11/35
81/28 - 81/35 is 81/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 35 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
81/28 = 81 × 5/28 × 5 = 405/140 - Likewise, for the 2nd fraction, since 35 × 4 = 140,
81/35 = 81 × 4/35 × 4 = 324/140 - Subtract the two like fractions:
405/140 - 324/140 = 405 - 324/140 = 81/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/56-81/35 81/28-81/70 81/84-81/35