Subtract 28/14 from 7/21
1st number: 7/21, 2nd number: 2 0/14
7/21 - 28/14 is -5/3.
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,
28/14 = 28 × 3/14 × 3 = 84/42 - Subtract the two like fractions:
14/42 - 84/42 = 14 - 84/42 = -70/42 - After reducing the fraction, the answer is -5/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-28/14 7/21-56/14 7/42-28/14 7/21-84/14 7/63-28/14 7/21-28/42 35/21-28/14 7/21-28/70 49/21-28/14 7/21-28/98