Add 10/81 and 72/80
10/81 + 72/80 is 829/810.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 80 is 6480
Next, find the equivalent fraction of both fractional numbers with denominator 6480 - For the 1st fraction, since 81 × 80 = 6480,
10/81 = 10 × 80/81 × 80 = 800/6480 - Likewise, for the 2nd fraction, since 80 × 81 = 6480,
72/80 = 72 × 81/80 × 81 = 5832/6480 - Add the two like fractions:
800/6480 + 5832/6480 = 800 + 5832/6480 = 6632/6480 - 6632/6480 simplified gives 829/810
- So, 10/81 + 72/80 = 829/810
In mixed form: 119/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/81+72/80 30/81+72/80 50/81+72/80 70/81+72/80