Subtract 20/81 from 25/15
1st number: 1 10/15, 2nd number: 20/81
25/15 - 20/81 is 115/81.
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,
25/15 = 25 × 27/15 × 27 = 675/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Subtract the two like fractions:
675/405 - 100/405 = 675 - 100/405 = 575/405 - After reducing the fraction, the answer is 115/81
- In mixed form: 134/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/15-20/81 25/15-40/81 25/30-20/81 75/15-20/81 25/15-60/81 25/45-20/81 25/75-20/81