Subtract 63/81 from 27/80
27/80 - 63/81 is -317/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 81 is 6480
Next, find the equivalent fraction of both fractional numbers with denominator 6480 - For the 1st fraction, since 80 × 81 = 6480,
27/80 = 27 × 81/80 × 81 = 2187/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
63/81 = 63 × 80/81 × 80 = 5040/6480 - Subtract the two like fractions:
2187/6480 - 5040/6480 = 2187 - 5040/6480 = -2853/6480 - After reducing the fraction, the answer is -317/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80-63/81 81/80-63/81