Subtract 18/81 from 7/5
1st number: 1 2/5, 2nd number: 18/81
7/5 - 18/81 is 53/45.
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,
7/5 = 7 × 81/5 × 81 = 567/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
18/81 = 18 × 5/81 × 5 = 90/405 - Subtract the two like fractions:
567/405 - 90/405 = 567 - 90/405 = 477/405 - After reducing the fraction, the answer is 53/45
- In mixed form: 18/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/5-18/81 7/5-36/81 7/10-18/81 21/5-18/81 7/5-54/81 7/15-18/81 35/5-18/81 7/5-90/81 7/25-18/81 49/5-18/81 7/35-18/81