Add 12/9 and 20/81
1st number: 1 3/9, 2nd number: 20/81
12/9 + 20/81 is 128/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 9 × 9 = 81,
12/9 = 12 × 9/9 × 9 = 108/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
20/81 = 20 × 1/81 × 1 = 20/81 - Add the two like fractions:
108/81 + 20/81 = 108 + 20/81 = 128/81 - So, 12/9 + 20/81 = 128/81
In mixed form: 147/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/9+20/81 12/9+40/81 12/18+20/81 36/9+20/81 12/9+60/81 12/27+20/81 60/9+20/81 12/45+20/81 84/9+20/81 12/63+20/81