Subtract 5/4 from 28/21
1st number: 1 7/21, 2nd number: 1 1/4
28/21 - 5/4 is 1/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
28/21 = 28 × 4/21 × 4 = 112/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
5/4 = 5 × 21/4 × 21 = 105/84 - Subtract the two like fractions:
112/84 - 105/84 = 112 - 105/84 = 7/84 - After reducing the fraction, the answer is 1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-5/4 28/21-10/4 28/42-5/4 28/21-5/8 84/21-5/4 28/21-15/4 28/63-5/4 28/21-5/12 28/21-25/4 28/21-5/20 28/21-35/4 28/21-5/28