Subtract 72/81 from 8/15
8/15 - 72/81 is -16/45.
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,
8/15 = 8 × 27/15 × 27 = 216/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
72/81 = 72 × 5/81 × 5 = 360/405 - Subtract the two like fractions:
216/405 - 360/405 = 216 - 360/405 = -144/405 - After reducing the fraction, the answer is -16/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-72/81 8/30-72/81 24/15-72/81 8/45-72/81 40/15-72/81 8/75-72/81 56/15-72/81