Subtract 10/18 from 90/81
1st number: 1 9/81, 2nd number: 10/18
90/81 - 10/18 is 5/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 18 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
90/81 = 90 × 2/81 × 2 = 180/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
10/18 = 10 × 9/18 × 9 = 90/162 - Subtract the two like fractions:
180/162 - 90/162 = 180 - 90/162 = 90/162 - After reducing the fraction, the answer is 5/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81-20/18 90/81-10/36 90/81-30/18 90/81-10/54 90/81-50/18 90/81-10/90 90/81-70/18