Add 36/72 and 20/81
36/72 + 20/81 is 121/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 72 × 9 = 648,
36/72 = 36 × 9/72 × 9 = 324/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
20/81 = 20 × 8/81 × 8 = 160/648 - Add the two like fractions:
324/648 + 160/648 = 324 + 160/648 = 484/648 - 484/648 simplified gives 121/162
- So, 36/72 + 20/81 = 121/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72+40/81 36/72+60/81