Subtract 3/21 from 27/72
27/72 - 3/21 is 13/56.
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,
27/72 = 27 × 7/72 × 7 = 189/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
3/21 = 3 × 24/21 × 24 = 72/504 - Subtract the two like fractions:
189/504 - 72/504 = 189 - 72/504 = 117/504 - After reducing the fraction, the answer is 13/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/72-3/21 27/72-6/21 27/72-3/42 81/72-3/21 27/72-9/21 27/72-3/63 27/72-15/21