Answers

Add 84/21 and 54/36

1^st number: 4 0/21, 2^nd number: 1 18/36

84/21 + 54/36 is 11/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 36 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 21 × 12 = 252,
   84/21 = 84 × 12/21 × 12 = 1008/252
3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
   54/36 = 54 × 7/36 × 7 = 378/252
4. Add the two like fractions:
   1008/252 + 378/252 = 1008 + 378/252 = 1386/252
5. 1386/252 simplified gives 11/2
6. So, 84/21 + 54/36 = 11/2
   In mixed form: 51/2

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