Add 20/81 and 7/9
20/81 + 7/9 is 83/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 9 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 81 × 1 = 81,
20/81 = 20 × 1/81 × 1 = 20/81 - Likewise, for the 2nd fraction, since 9 × 9 = 81,
7/9 = 7 × 9/9 × 9 = 63/81 - Add the two like fractions:
20/81 + 63/81 = 20 + 63/81 = 83/81 - So, 20/81 + 7/9 = 83/81
In mixed form: 12/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81+7/9 20/81+14/9 20/81+7/18 60/81+7/9 20/81+21/9 20/81+7/27 20/81+35/9 20/81+7/45 20/81+49/9 20/81+7/63