Answers

Add 84/63 and 18/12

1^st number: 1 21/63, 2^nd number: 1 6/12

84/63 + 18/12 is 17/6.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 12 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 63 × 4 = 252,
   84/63 = 84 × 4/63 × 4 = 336/252
3. Likewise, for the 2nd fraction, since 12 × 21 = 252,
   18/12 = 18 × 21/12 × 21 = 378/252
4. Add the two like fractions:
   336/252 + 378/252 = 336 + 378/252 = 714/252
5. 714/252 simplified gives 17/6
6. So, 84/63 + 18/12 = 17/6
   In mixed form: 25/6

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