Subtract 7/81 from 30/15
1st number: 2 0/15, 2nd number: 7/81
30/15 - 7/81 is 155/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
30/15 = 30 × 27/15 × 27 = 810/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
7/81 = 7 × 5/81 × 5 = 35/405 - Subtract the two like fractions:
810/405 - 35/405 = 810 - 35/405 = 775/405 - After reducing the fraction, the answer is 155/81
- In mixed form: 174/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15-7/81 30/15-14/81 90/15-7/81 30/15-21/81 30/45-7/81 30/15-35/81 30/75-7/81 30/15-49/81