Add 20/72 and 10/81
20/72 + 10/81 is 65/162.
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,
20/72 = 20 × 9/72 × 9 = 180/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
10/81 = 10 × 8/81 × 8 = 80/648 - Add the two like fractions:
180/648 + 80/648 = 180 + 80/648 = 260/648 - 260/648 simplified gives 65/162
- So, 20/72 + 10/81 = 65/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72+10/81 20/72+20/81 60/72+10/81 20/72+30/81 20/72+50/81 20/72+70/81