Subtract 28/14 from 10/21
1st number: 10/21, 2nd number: 2 0/14
10/21 - 28/14 is -32/21.
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,
10/21 = 10 × 2/21 × 2 = 20/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
28/14 = 28 × 3/14 × 3 = 84/42 - Subtract the two like fractions:
20/42 - 84/42 = 20 - 84/42 = -64/42 - After reducing the fraction, the answer is -32/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-28/14 10/21-56/14 10/42-28/14 30/21-28/14 10/21-84/14 10/63-28/14 10/21-28/42 50/21-28/14 10/21-28/70 70/21-28/14 10/21-28/98