Subtract 7/15 from 28/63
28/63 - 7/15 is -1/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 15 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
28/63 = 28 × 5/63 × 5 = 140/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
7/15 = 7 × 21/15 × 21 = 147/315 - Subtract the two like fractions:
140/315 - 147/315 = 140 - 147/315 = -7/315 - After reducing the fraction, the answer is -1/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/63-7/15 28/63-14/15 28/63-7/30 84/63-7/15 28/63-21/15 28/63-7/45 28/63-35/15 28/63-7/75 28/63-49/15