Add 20/36 and 28/81
20/36 + 28/81 is 73/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 36 × 9 = 324,
20/36 = 20 × 9/36 × 9 = 180/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
28/81 = 28 × 4/81 × 4 = 112/324 - Add the two like fractions:
180/324 + 112/324 = 180 + 112/324 = 292/324 - 292/324 simplified gives 73/81
- So, 20/36 + 28/81 = 73/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/36+28/81 20/36+56/81 20/72+28/81 60/36+28/81 20/36+84/81