Subtract 5/15 from 81/28
1st number: 2 25/28, 2nd number: 5/15
81/28 - 5/15 is 215/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
81/28 = 81 × 15/28 × 15 = 1215/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
5/15 = 5 × 28/15 × 28 = 140/420 - Subtract the two like fractions:
1215/420 - 140/420 = 1215 - 140/420 = 1075/420 - After reducing the fraction, the answer is 215/84
- In mixed form: 247/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/28-10/15 81/56-5/15 81/28-5/30 81/84-5/15 81/28-5/45 81/28-25/15 81/28-5/75 81/28-35/15