Subtract 21/63 from 6/7
6/7 - 21/63 is 11/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
6/7 = 6 × 9/7 × 9 = 54/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
21/63 = 21 × 1/63 × 1 = 21/63 - Subtract the two like fractions:
54/63 - 21/63 = 54 - 21/63 = 33/63 - After reducing the fraction, the answer is 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/7-21/63 6/7-42/63 6/14-21/63 18/7-21/63 6/21-21/63 30/7-21/63 6/35-21/63 42/7-21/63 6/49-21/63