Subtract 42/81 from 18/14
1st number: 1 4/14, 2nd number: 42/81
18/14 - 42/81 is 145/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 14 × 81 = 1134,
18/14 = 18 × 81/14 × 81 = 1458/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
42/81 = 42 × 14/81 × 14 = 588/1134 - Subtract the two like fractions:
1458/1134 - 588/1134 = 1458 - 588/1134 = 870/1134 - After reducing the fraction, the answer is 145/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/14-42/81 18/14-84/81 18/28-42/81 54/14-42/81 18/42-42/81 90/14-42/81 18/70-42/81 18/98-42/81