Answers

Add 84/21 and 84/5

1^st number: 4 0/21, 2^nd number: 16 4/5

84/21 + 84/5 is 104/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 5 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 21 × 5 = 105,
   84/21 = 84 × 5/21 × 5 = 420/105
3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
   84/5 = 84 × 21/5 × 21 = 1764/105
4. Add the two like fractions:
   420/105 + 1764/105 = 420 + 1764/105 = 2184/105
5. 2184/105 simplified gives 104/5
6. So, 84/21 + 84/5 = 104/5
   In mixed form: 204/5

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