Answers

Add 28/81 and 30/72

28/81 + 30/72 is 247/324.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 81 × 8 = 648,
   28/81 = 28 × 8/81 × 8 = 224/648
3. Likewise, for the 2nd fraction, since 72 × 9 = 648,
   30/72 = 30 × 9/72 × 9 = 270/648
4. Add the two like fractions:
   224/648 + 270/648 = 224 + 270/648 = 494/648
5. 494/648 simplified gives 247/324
6. So, 28/81 + 30/72 = 247/324

MathStep (Works offline)

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

Related: ⁵⁶/₈₁+³⁰/₇₂ ²⁸/₈₁+⁶⁰/₇₂ ⁸⁴/₈₁+³⁰/₇₂ ²⁸/₈₁+⁹⁰/₇₂

Add Fractions Calculator