Subtract 18/81 from 18/5
1st number: 3 3/5, 2nd number: 18/81
18/5 - 18/81 is 152/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
18/5 = 18 × 81/5 × 81 = 1458/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
18/81 = 18 × 5/81 × 5 = 90/405 - Subtract the two like fractions:
1458/405 - 90/405 = 1458 - 90/405 = 1368/405 - After reducing the fraction, the answer is 152/45
- In mixed form: 317/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5-18/81 18/5-36/81 18/10-18/81 54/5-18/81 18/5-54/81 18/15-18/81 90/5-18/81 18/5-90/81 18/25-18/81 18/35-18/81