Subtract 28/15 from 45/28
1st number: 1 17/28, 2nd number: 1 13/15
45/28 - 28/15 is -109/420.
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,
45/28 = 45 × 15/28 × 15 = 675/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
28/15 = 28 × 28/15 × 28 = 784/420 - Subtract the two like fractions:
675/420 - 784/420 = 675 - 784/420 = -109/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28-28/15 45/28-56/15 45/56-28/15 45/28-28/30 45/28-84/15 45/84-28/15 45/28-28/45 45/28-28/75