Answers

Add 4/72 and 5/81

4/72 + 5/81 is 19/162.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 72 × 9 = 648,
   4/72 = 4 × 9/72 × 9 = 36/648
3. Likewise, for the 2nd fraction, since 81 × 8 = 648,
   5/81 = 5 × 8/81 × 8 = 40/648
4. Add the two like fractions:
   36/648 + 40/648 = 36 + 40/648 = 76/648
5. 76/648 simplified gives 19/162
6. So, 4/72 + 5/81 = 19/162

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁸/₇₂+⁵/₈₁ ⁴/₇₂+¹⁰/₈₁ ¹²/₇₂+⁵/₈₁ ⁴/₇₂+¹⁵/₈₁ ²⁰/₇₂+⁵/₈₁ ⁴/₇₂+²⁵/₈₁ ²⁸/₇₂+⁵/₈₁ ⁴/₇₂+³⁵/₈₁

Add Fractions Calculator