Subtract 4/21 from 27/72
27/72 - 4/21 is 31/168.
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,
27/72 = 27 × 7/72 × 7 = 189/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
4/21 = 4 × 24/21 × 24 = 96/504 - Subtract the two like fractions:
189/504 - 96/504 = 189 - 96/504 = 93/504 - After reducing the fraction, the answer is 31/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/72-4/21 27/72-8/21 27/72-4/42 81/72-4/21 27/72-12/21 27/72-4/63 27/72-20/21 27/72-28/21