Subtract 63/45 from 15/21
1st number: 15/21, 2nd number: 1 18/45
15/21 - 63/45 is -24/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
15/21 = 15 × 15/21 × 15 = 225/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
63/45 = 63 × 7/45 × 7 = 441/315 - Subtract the two like fractions:
225/315 - 441/315 = 225 - 441/315 = -216/315 - After reducing the fraction, the answer is -24/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21-63/45 15/42-63/45 15/21-63/90 45/21-63/45 15/63-63/45 75/21-63/45