Subtract 21/15 from 21/63
1st number: 21/63, 2nd number: 1 6/15
21/63 - 21/15 is -16/15.
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,
21/63 = 21 × 5/63 × 5 = 105/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
21/15 = 21 × 21/15 × 21 = 441/315 - Subtract the two like fractions:
105/315 - 441/315 = 105 - 441/315 = -336/315 - After reducing the fraction, the answer is -16/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63-21/15 21/63-42/15 21/63-21/30 21/63-63/15 21/63-21/45 21/63-21/75