Subtract 90/81 from 4/6
1st number: 4/6, 2nd number: 1 9/81
4/6 - 90/81 is -4/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 6 × 27 = 162,
4/6 = 4 × 27/6 × 27 = 108/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
90/81 = 90 × 2/81 × 2 = 180/162 - Subtract the two like fractions:
108/162 - 180/162 = 108 - 180/162 = -72/162 - After reducing the fraction, the answer is -4/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/6-90/81 4/12-90/81 12/6-90/81 4/18-90/81 20/6-90/81 4/30-90/81 28/6-90/81 4/42-90/81