Subtract 20/81 from 14/42
14/42 - 20/81 is 7/81.
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,
14/42 = 14 × 27/42 × 27 = 378/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
20/81 = 20 × 14/81 × 14 = 280/1134 - Subtract the two like fractions:
378/1134 - 280/1134 = 378 - 280/1134 = 98/1134 - After reducing the fraction, the answer is 7/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/42-20/81 14/42-40/81 14/84-20/81 14/42-60/81 70/42-20/81 98/42-20/81