Subtract 21/15 from 27/63
1st number: 27/63, 2nd number: 1 6/15
27/63 - 21/15 is -34/35.
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,
27/63 = 27 × 5/63 × 5 = 135/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
21/15 = 21 × 21/15 × 21 = 441/315 - Subtract the two like fractions:
135/315 - 441/315 = 135 - 441/315 = -306/315 - After reducing the fraction, the answer is -34/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/63-21/15 27/63-42/15 27/63-21/30 81/63-21/15 27/63-63/15 27/63-21/45 27/63-21/75