Answers

Add 30/72 and 20/81

30/72 + 20/81 is 215/324.

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,
   30/72 = 30 × 9/72 × 9 = 270/648
3. Likewise, for the 2nd fraction, since 81 × 8 = 648,
   20/81 = 20 × 8/81 × 8 = 160/648
4. Add the two like fractions:
   270/648 + 160/648 = 270 + 160/648 = 430/648
5. 430/648 simplified gives 215/324
6. So, 30/72 + 20/81 = 215/324

MathStep (Works offline)

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

Related: ⁶⁰/₇₂+²⁰/₈₁ ³⁰/₇₂+⁴⁰/₈₁ ⁹⁰/₇₂+²⁰/₈₁ ³⁰/₇₂+⁶⁰/₈₁

Add Fractions Calculator