Subtract 9/21 from 63/72
63/72 - 9/21 is 25/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
63/72 = 63 × 7/72 × 7 = 441/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
9/21 = 9 × 24/21 × 24 = 216/504 - Subtract the two like fractions:
441/504 - 216/504 = 441 - 216/504 = 225/504 - After reducing the fraction, the answer is 25/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/72-18/21 63/72-9/42 63/72-27/21 63/72-9/63 63/72-45/21 63/72-63/21