Subtract 28/21 from 10/28
1st number: 10/28, 2nd number: 1 7/21
10/28 - 28/21 is -41/42.
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,
10/28 = 10 × 3/28 × 3 = 30/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
28/21 = 28 × 4/21 × 4 = 112/84 - Subtract the two like fractions:
30/84 - 112/84 = 30 - 112/84 = -82/84 - After reducing the fraction, the answer is -41/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/28-28/21 10/28-56/21 10/56-28/21 10/28-28/42 30/28-28/21 10/28-84/21 10/84-28/21 10/28-28/63 50/28-28/21 70/28-28/21