Subtract 14/81 from 18/40
18/40 - 14/81 is 449/1620.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 81 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 40 × 81 = 3240,
18/40 = 18 × 81/40 × 81 = 1458/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
14/81 = 14 × 40/81 × 40 = 560/3240 - Subtract the two like fractions:
1458/3240 - 560/3240 = 1458 - 560/3240 = 898/3240 - After reducing the fraction, the answer is 449/1620
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40-14/81 18/40-28/81 18/80-14/81 54/40-14/81 18/40-42/81 90/40-14/81 18/40-70/81 18/40-98/81