Subtract 4/18 from 21/56
21/56 - 4/18 is 11/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 18 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 56 × 9 = 504,
21/56 = 21 × 9/56 × 9 = 189/504 - Likewise, for the 2nd fraction, since 18 × 28 = 504,
4/18 = 4 × 28/18 × 28 = 112/504 - Subtract the two like fractions:
189/504 - 112/504 = 189 - 112/504 = 77/504 - After reducing the fraction, the answer is 11/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-4/18 21/56-8/18 21/56-4/36 63/56-4/18 21/56-12/18 21/56-4/54 21/56-20/18 21/56-4/90 21/56-28/18