Subtract 21/18 from 21/56
1st number: 21/56, 2nd number: 1 3/18
21/56 - 21/18 is -19/24.
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,
21/18 = 21 × 28/18 × 28 = 588/504 - Subtract the two like fractions:
189/504 - 588/504 = 189 - 588/504 = -399/504 - After reducing the fraction, the answer is -19/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-21/18 21/56-42/18 21/56-21/36 63/56-21/18 21/56-63/18 21/56-21/54 21/56-21/90