Subtract 21/81 from 10/9
1st number: 1 1/9, 2nd number: 21/81
10/9 - 21/81 is 23/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 9 × 9 = 81,
10/9 = 10 × 9/9 × 9 = 90/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
21/81 = 21 × 1/81 × 1 = 21/81 - Subtract the two like fractions:
90/81 - 21/81 = 90 - 21/81 = 69/81 - After reducing the fraction, the answer is 23/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/9-21/81 10/9-42/81 10/18-21/81 30/9-21/81 10/9-63/81 10/27-21/81 50/9-21/81 10/45-21/81 70/9-21/81 10/63-21/81