Subtract 90/81 from 28/54
1st number: 28/54, 2nd number: 1 9/81
28/54 - 90/81 is -16/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 54 × 3 = 162,
28/54 = 28 × 3/54 × 3 = 84/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
90/81 = 90 × 2/81 × 2 = 180/162 - Subtract the two like fractions:
84/162 - 180/162 = 84 - 180/162 = -96/162 - After reducing the fraction, the answer is -16/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/54-90/81 84/54-90/81