Subtract 80/81 from 27/15
1st number: 1 12/15, 2nd number: 80/81
27/15 - 80/81 is 329/405.
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,
27/15 = 27 × 27/15 × 27 = 729/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
80/81 = 80 × 5/81 × 5 = 400/405 - Subtract the two like fractions:
729/405 - 400/405 = 729 - 400/405 = 329/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15-80/81 27/30-80/81 81/15-80/81 27/45-80/81 27/75-80/81