Add 5/80 and 70/81
5/80 + 70/81 is 1201/1296.
Steps for adding 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,
5/80 = 5 × 81/80 × 81 = 405/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
70/81 = 70 × 80/81 × 80 = 5600/6480 - Add the two like fractions:
405/6480 + 5600/6480 = 405 + 5600/6480 = 6005/6480 - 6005/6480 simplified gives 1201/1296
- So, 5/80 + 70/81 = 1201/1296
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/80+70/81 15/80+70/81 25/80+70/81 35/80+70/81