Subtract 63/15 from 45/21
1st number: 2 3/21, 2nd number: 4 3/15
45/21 - 63/15 is -72/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
45/21 = 45 × 5/21 × 5 = 225/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
63/15 = 63 × 7/15 × 7 = 441/105 - Subtract the two like fractions:
225/105 - 441/105 = 225 - 441/105 = -216/105 - After reducing the fraction, the answer is -72/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-63/15 45/42-63/15 45/21-63/30 45/63-63/15 45/21-63/45 45/21-63/75