Subtract 21/56 from 12/18
12/18 - 21/56 is 7/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 56 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 18 × 28 = 504,
12/18 = 12 × 28/18 × 28 = 336/504 - Likewise, for the 2nd fraction, since 56 × 9 = 504,
21/56 = 21 × 9/56 × 9 = 189/504 - Subtract the two like fractions:
336/504 - 189/504 = 336 - 189/504 = 147/504 - After reducing the fraction, the answer is 7/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18-21/56 12/18-42/56 12/36-21/56 36/18-21/56 12/18-63/56 12/54-21/56 60/18-21/56 12/90-21/56 84/18-21/56