Answers

Add 63/54 and 21/84

1^st number: 1 9/54, 2^nd number: 21/84

63/54 + 21/84 is 17/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 84 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 54 × 14 = 756,
   63/54 = 63 × 14/54 × 14 = 882/756
3. Likewise, for the 2nd fraction, since 84 × 9 = 756,
   21/84 = 21 × 9/84 × 9 = 189/756
4. Add the two like fractions:
   882/756 + 189/756 = 882 + 189/756 = 1071/756
5. 1071/756 simplified gives 17/12
6. So, 63/54 + 21/84 = 17/12
   In mixed form: 15/12

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