Answers

Add 24/81 and 21/84

24/81 + 21/84 is 59/108.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 84 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 81 × 28 = 2268,
   24/81 = 24 × 28/81 × 28 = 672/2268
3. Likewise, for the 2nd fraction, since 84 × 27 = 2268,
   21/84 = 21 × 27/84 × 27 = 567/2268
4. Add the two like fractions:
   672/2268 + 567/2268 = 672 + 567/2268 = 1239/2268
5. 1239/2268 simplified gives 59/108
6. So, 24/81 + 21/84 = 59/108

MathStep (Works offline)

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

Related: ⁴⁸/₈₁+²¹/₈₄ ²⁴/₈₁+⁴²/₈₄ ⁷²/₈₁+²¹/₈₄ ²⁴/₈₁+⁶³/₈₄

Add Fractions Calculator