Add 70/81 and 90/80
1st number: 70/81, 2nd number: 1 10/80
70/81 + 90/80 is 1289/648.
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,
70/81 = 70 × 80/81 × 80 = 5600/6480 - Likewise, for the 2nd fraction, since 80 × 81 = 6480,
90/80 = 90 × 81/80 × 81 = 7290/6480 - Add the two like fractions:
5600/6480 + 7290/6480 = 5600 + 7290/6480 = 12890/6480 - 12890/6480 simplified gives 1289/648
- So, 70/81 + 90/80 = 1289/648
In mixed form: 1641/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: