Answers

Add 28/21 and 63/27

1^st number: 1 7/21, 2^nd number: 2 9/27

28/21 + 63/27 is 11/3.

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,
   28/21 = 28 × 9/21 × 9 = 252/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   63/27 = 63 × 7/27 × 7 = 441/189
4. Add the two like fractions:
   252/189 + 441/189 = 252 + 441/189 = 693/189
5. 693/189 simplified gives 11/3
6. So, 28/21 + 63/27 = 11/3
   In mixed form: 32/3

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