Subtract 21/7 from 21/63
1st number: 21/63, 2nd number: 3 0/7
21/63 - 21/7 is -8/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
21/63 = 21 × 1/63 × 1 = 21/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
21/7 = 21 × 9/7 × 9 = 189/63 - Subtract the two like fractions:
21/63 - 189/63 = 21 - 189/63 = -168/63 - After reducing the fraction, the answer is -8/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63-21/7 21/63-42/7 21/63-21/14 21/63-63/7 21/63-21/35 21/63-21/49