Answers

Add 72/27 and 21/84

1^st number: 2 18/27, 2^nd number: 21/84

72/27 + 21/84 is 35/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 84 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 27 × 28 = 756,
   72/27 = 72 × 28/27 × 28 = 2016/756
3. Likewise, for the 2nd fraction, since 84 × 9 = 756,
   21/84 = 21 × 9/84 × 9 = 189/756
4. Add the two like fractions:
   2016/756 + 189/756 = 2016 + 189/756 = 2205/756
5. 2205/756 simplified gives 35/12
6. So, 72/27 + 21/84 = 35/12
   In mixed form: 211/12

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