Subtract 7/81 from 28/3
1st number: 9 1/3, 2nd number: 7/81
28/3 - 7/81 is 749/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 3 × 27 = 81,
28/3 = 28 × 27/3 × 27 = 756/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
7/81 = 7 × 1/81 × 1 = 7/81 - Subtract the two like fractions:
756/81 - 7/81 = 756 - 7/81 = 749/81 - In mixed form: 920/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/3-7/81 28/3-14/81 28/6-7/81 84/3-7/81 28/3-21/81 28/9-7/81 28/3-35/81 28/15-7/81 28/3-49/81 28/21-7/81