Add 15/81 and 20/18
1st number: 15/81, 2nd number: 1 2/18
15/81 + 20/18 is 35/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 18 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
15/81 = 15 × 2/81 × 2 = 30/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
20/18 = 20 × 9/18 × 9 = 180/162 - Add the two like fractions:
30/162 + 180/162 = 30 + 180/162 = 210/162 - 210/162 simplified gives 35/27
- So, 15/81 + 20/18 = 35/27
In mixed form: 18/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81+20/18 15/81+40/18 15/81+20/36 45/81+20/18 15/81+60/18 15/81+20/54 75/81+20/18 15/81+20/90