Subtract 6/14 from 18/21
18/21 - 6/14 is 3/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
18/21 = 18 × 2/21 × 2 = 36/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
6/14 = 6 × 3/14 × 3 = 18/42 - Subtract the two like fractions:
36/42 - 18/42 = 36 - 18/42 = 18/42 - After reducing the fraction, the answer is 3/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-6/14 18/21-12/14 18/42-6/14 18/21-6/28 54/21-6/14 18/21-18/14 18/63-6/14 18/21-6/42 90/21-6/14 18/21-30/14 18/21-6/70 18/21-42/14 18/21-6/98