Subtract 7/72 from 21/3
1st number: 7 0/3, 2nd number: 7/72
21/3 - 7/72 is 497/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 3 × 24 = 72,
21/3 = 21 × 24/3 × 24 = 504/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
7/72 = 7 × 1/72 × 1 = 7/72 - Subtract the two like fractions:
504/72 - 7/72 = 504 - 7/72 = 497/72 - In mixed form: 665/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-7/72 21/3-14/72 21/6-7/72 63/3-7/72 21/3-21/72 21/9-7/72 21/3-35/72 21/15-7/72 21/3-49/72