Subtract 6/21 from 18/28
18/28 - 6/21 is 5/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
18/28 = 18 × 3/28 × 3 = 54/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Subtract the two like fractions:
54/84 - 24/84 = 54 - 24/84 = 30/84 - After reducing the fraction, the answer is 5/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-6/21 18/28-12/21 18/56-6/21 18/28-6/42 54/28-6/21 18/28-18/21 18/84-6/21 18/28-6/63 90/28-6/21 18/28-30/21 18/28-42/21