Add 20/72 and 6/81
20/72 + 6/81 is 19/54.
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,
6/81 = 6 × 8/81 × 8 = 48/648 - Add the two like fractions:
180/648 + 48/648 = 180 + 48/648 = 228/648 - 228/648 simplified gives 19/54
- So, 20/72 + 6/81 = 19/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72+6/81 20/72+12/81 60/72+6/81 20/72+18/81 20/72+30/81 20/72+42/81