Subtract 1/81 from 20/24
20/24 - 1/81 is 133/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 24 × 27 = 648,
20/24 = 20 × 27/24 × 27 = 540/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
1/81 = 1 × 8/81 × 8 = 8/648 - Subtract the two like fractions:
540/648 - 8/648 = 540 - 8/648 = 532/648 - After reducing the fraction, the answer is 133/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/24-1/81 20/24-2/81 20/48-1/81 60/24-1/81 20/24-3/81 20/72-1/81 20/24-5/81 20/24-7/81