Subtract 35/9 from 72/21
1st number: 3 9/21, 2nd number: 3 8/9
72/21 - 35/9 is -29/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 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 9 × 7 = 63,
35/9 = 35 × 7/9 × 7 = 245/63 - Subtract the two like fractions:
216/63 - 245/63 = 216 - 245/63 = -29/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21-70/9 72/42-35/9 72/21-35/18 72/63-35/9 72/21-35/27 72/21-35/45 72/21-35/63