Subtract 28/15 from 3/84
1st number: 3/84, 2nd number: 1 13/15
3/84 - 28/15 is -769/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
3/84 = 3 × 5/84 × 5 = 15/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
28/15 = 28 × 28/15 × 28 = 784/420 - Subtract the two like fractions:
15/420 - 784/420 = 15 - 784/420 = -769/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84-28/15 3/84-56/15 3/84-28/30 9/84-28/15 3/84-84/15 3/84-28/45 15/84-28/15 3/84-28/75 21/84-28/15