Add 7/81 and 4/72
7/81 + 4/72 is 23/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 72 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
7/81 = 7 × 8/81 × 8 = 56/648 - Likewise, for the 2nd fraction, since 72 × 9 = 648,
4/72 = 4 × 9/72 × 9 = 36/648 - Add the two like fractions:
56/648 + 36/648 = 56 + 36/648 = 92/648 - 92/648 simplified gives 23/162
- So, 7/81 + 4/72 = 23/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81+4/72 7/81+8/72 21/81+4/72 7/81+12/72 35/81+4/72 7/81+20/72 49/81+4/72 7/81+28/72