Subtract 27/72 from 10/21
10/21 - 27/72 is 17/168.
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,
10/21 = 10 × 24/21 × 24 = 240/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
27/72 = 27 × 7/72 × 7 = 189/504 - Subtract the two like fractions:
240/504 - 189/504 = 240 - 189/504 = 51/504 - After reducing the fraction, the answer is 17/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-27/72 10/21-54/72 10/42-27/72 30/21-27/72 10/21-81/72 10/63-27/72 50/21-27/72 70/21-27/72