Add 4/81 and 56/72
4/81 + 56/72 is 67/81.
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,
4/81 = 4 × 8/81 × 8 = 32/648 - Likewise, for the 2nd fraction, since 72 × 9 = 648,
56/72 = 56 × 9/72 × 9 = 504/648 - Add the two like fractions:
32/648 + 504/648 = 32 + 504/648 = 536/648 - 536/648 simplified gives 67/81
- So, 4/81 + 56/72 = 67/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/81+56/72 12/81+56/72 20/81+56/72 28/81+56/72