Subtract 28/56 from 90/21
1st number: 4 6/21, 2nd number: 28/56
90/21 - 28/56 is 53/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
28/56 = 28 × 3/56 × 3 = 84/168 - Subtract the two like fractions:
720/168 - 84/168 = 720 - 84/168 = 636/168 - After reducing the fraction, the answer is 53/14
- In mixed form: 311/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-28/56 90/21-84/56 90/63-28/56