Subtract 10/81 from 18/42
18/42 - 10/81 is 173/567.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
18/42 = 18 × 27/42 × 27 = 486/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
10/81 = 10 × 14/81 × 14 = 140/1134 - Subtract the two like fractions:
486/1134 - 140/1134 = 486 - 140/1134 = 346/1134 - After reducing the fraction, the answer is 173/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-10/81 18/42-20/81 18/84-10/81 54/42-10/81 18/42-30/81 90/42-10/81 18/42-50/81 18/42-70/81