Subtract 15/21 from 7/63
7/63 - 15/21 is -38/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
7/63 = 7 × 1/63 × 1 = 7/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
15/21 = 15 × 3/21 × 3 = 45/63 - Subtract the two like fractions:
7/63 - 45/63 = 7 - 45/63 = -38/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/63-15/21 7/63-30/21 7/63-15/42 21/63-15/21 7/63-45/21 7/63-15/63 35/63-15/21 7/63-75/21 49/63-15/21