Subtract 1/81 from 20/15
1st number: 1 5/15, 2nd number: 1/81
20/15 - 1/81 is 107/81.
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,
20/15 = 20 × 27/15 × 27 = 540/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
1/81 = 1 × 5/81 × 5 = 5/405 - Subtract the two like fractions:
540/405 - 5/405 = 540 - 5/405 = 535/405 - After reducing the fraction, the answer is 107/81
- In mixed form: 126/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-1/81 20/15-2/81 20/30-1/81 60/15-1/81 20/15-3/81 20/45-1/81 20/15-5/81 20/75-1/81 20/15-7/81