Subtract 6/28 from 21/18
1st number: 1 3/18, 2nd number: 6/28
21/18 - 6/28 is 20/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 18 × 14 = 252,
21/18 = 21 × 14/18 × 14 = 294/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
6/28 = 6 × 9/28 × 9 = 54/252 - Subtract the two like fractions:
294/252 - 54/252 = 294 - 54/252 = 240/252 - After reducing the fraction, the answer is 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-6/28 21/18-12/28 21/36-6/28 21/18-6/56 63/18-6/28 21/18-18/28 21/54-6/28 21/18-6/84 21/18-30/28 21/90-6/28 21/18-42/28