Subtract 49/72 from 9/21
9/21 - 49/72 is -127/504.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
9/21 = 9 × 24/21 × 24 = 216/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
49/72 = 49 × 7/72 × 7 = 343/504 - Subtract the two like fractions:
216/504 - 343/504 = 216 - 343/504 = -127/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-49/72 9/21-98/72 9/42-49/72 27/21-49/72 9/63-49/72 45/21-49/72 63/21-49/72