Subtract 9/63 from 21/7
1st number: 3 0/7, 2nd number: 9/63
21/7 - 9/63 is 20/7.
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,
21/7 = 21 × 9/7 × 9 = 189/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
9/63 = 9 × 1/63 × 1 = 9/63 - Subtract the two like fractions:
189/63 - 9/63 = 189 - 9/63 = 180/63 - After reducing the fraction, the answer is 20/7
- In mixed form: 26/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-9/63 21/7-18/63 21/14-9/63 63/7-9/63 21/7-27/63 21/7-45/63 21/35-9/63 21/49-9/63