Subtract 3/21 from 7/63
7/63 - 3/21 is -2/63.
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,
3/21 = 3 × 3/21 × 3 = 9/63 - Subtract the two like fractions:
7/63 - 9/63 = 7 - 9/63 = -2/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/63-3/21 7/63-6/21 7/63-3/42 21/63-3/21 7/63-9/21 7/63-3/63 35/63-3/21 7/63-15/21 49/63-3/21