Add 4/72 and 9/81
4/72 + 9/81 is 1/6.
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,
4/72 = 4 × 9/72 × 9 = 36/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
9/81 = 9 × 8/81 × 8 = 72/648 - Add the two like fractions:
36/648 + 72/648 = 36 + 72/648 = 108/648 - 108/648 simplified gives 1/6
- So, 4/72 + 9/81 = 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/72+9/81 4/72+18/81 12/72+9/81 4/72+27/81 20/72+9/81 4/72+45/81 28/72+9/81 4/72+63/81