Answers

Add 84/21 and 28/27

1^st number: 4 0/21, 2^nd number: 1 1/27

84/21 + 28/27 is 136/27.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 27 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 21 × 9 = 189,
   84/21 = 84 × 9/21 × 9 = 756/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   28/27 = 28 × 7/27 × 7 = 196/189
4. Add the two like fractions:
   756/189 + 196/189 = 756 + 196/189 = 952/189
5. 952/189 simplified gives 136/27
6. So, 84/21 + 28/27 = 136/27
   In mixed form: 51/27

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