Subtract 28/15 from 12/28
1st number: 12/28, 2nd number: 1 13/15
12/28 - 28/15 is -151/105.
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,
12/28 = 12 × 15/28 × 15 = 180/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
28/15 = 28 × 28/15 × 28 = 784/420 - Subtract the two like fractions:
180/420 - 784/420 = 180 - 784/420 = -604/420 - After reducing the fraction, the answer is -151/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-28/15 12/28-56/15 12/56-28/15 12/28-28/30 36/28-28/15 12/28-84/15 12/84-28/15 12/28-28/45 60/28-28/15 12/28-28/75 84/28-28/15