Subtract 30/81 from 18/24
18/24 - 30/81 is 41/108.
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,
18/24 = 18 × 27/24 × 27 = 486/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
30/81 = 30 × 8/81 × 8 = 240/648 - Subtract the two like fractions:
486/648 - 240/648 = 486 - 240/648 = 246/648 - After reducing the fraction, the answer is 41/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/24-30/81 18/24-60/81 18/48-30/81 54/24-30/81 18/24-90/81 18/72-30/81 90/24-30/81