Subtract 90/81 from 18/10
1st number: 1 8/10, 2nd number: 1 9/81
18/10 - 90/81 is 31/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 10 × 81 = 810,
18/10 = 18 × 81/10 × 81 = 1458/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
90/81 = 90 × 10/81 × 10 = 900/810 - Subtract the two like fractions:
1458/810 - 900/810 = 1458 - 900/810 = 558/810 - After reducing the fraction, the answer is 31/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/10-90/81 18/20-90/81 54/10-90/81 18/30-90/81 90/10-90/81 18/50-90/81 18/70-90/81