Subtract 5/14 from 7/21
7/21 - 5/14 is -1/42.
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,
7/21 = 7 × 2/21 × 2 = 14/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
5/14 = 5 × 3/14 × 3 = 15/42 - Subtract the two like fractions:
14/42 - 15/42 = 14 - 15/42 = -1/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-5/14 7/21-10/14 7/42-5/14 7/21-5/28 7/21-15/14 7/63-5/14 7/21-5/42 35/21-5/14 7/21-25/14 7/21-5/70 49/21-5/14 7/21-35/14 7/21-5/98