Answers

Add 21/84 and 18/27

21/84 + 18/27 is 11/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 27 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 84 × 9 = 756,
   21/84 = 21 × 9/84 × 9 = 189/756
3. Likewise, for the 2nd fraction, since 27 × 28 = 756,
   18/27 = 18 × 28/27 × 28 = 504/756
4. Add the two like fractions:
   189/756 + 504/756 = 189 + 504/756 = 693/756
5. 693/756 simplified gives 11/12
6. So, 21/84 + 18/27 = 11/12

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