Subtract 20/18 from 15/56
1st number: 15/56, 2nd number: 1 2/18
15/56 - 20/18 is -425/504.
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,
15/56 = 15 × 9/56 × 9 = 135/504 - Likewise, for the 2nd fraction, since 18 × 28 = 504,
20/18 = 20 × 28/18 × 28 = 560/504 - Subtract the two like fractions:
135/504 - 560/504 = 135 - 560/504 = -425/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/56-20/18 15/56-40/18 15/56-20/36 45/56-20/18 15/56-60/18 15/56-20/54 75/56-20/18 15/56-20/90