Subtract 7/63 from 72/21
1st number: 3 9/21, 2nd number: 7/63
72/21 - 7/63 is 209/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
72/21 = 72 × 3/21 × 3 = 216/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
7/63 = 7 × 1/63 × 1 = 7/63 - Subtract the two like fractions:
216/63 - 7/63 = 216 - 7/63 = 209/63 - In mixed form: 320/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21-14/63 72/42-7/63 72/21-21/63 72/63-7/63 72/21-35/63 72/21-49/63