Subtract 4/28 from 21/18
1st number: 1 3/18, 2nd number: 4/28
21/18 - 4/28 is 43/42.
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,
4/28 = 4 × 9/28 × 9 = 36/252 - Subtract the two like fractions:
294/252 - 36/252 = 294 - 36/252 = 258/252 - After reducing the fraction, the answer is 43/42
- In mixed form: 11/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-4/28 21/18-8/28 21/36-4/28 21/18-4/56 63/18-4/28 21/18-12/28 21/54-4/28 21/18-4/84 21/18-20/28 21/90-4/28