Subtract 49/81 from 81/80
1st number: 1 1/80, 2nd number: 49/81
81/80 - 49/81 is 2641/6480.
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,
81/80 = 81 × 81/80 × 81 = 6561/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
49/81 = 49 × 80/81 × 80 = 3920/6480 - Subtract the two like fractions:
6561/6480 - 3920/6480 = 6561 - 3920/6480 = 2641/6480
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80-98/81