Answers

Add 72/42 and 84/81

1^st number: 1 30/42, 2^nd number: 1 3/81

72/42 + 84/81 is 520/189.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 81 is 1134
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1134
2. For the 1st fraction, since 42 × 27 = 1134,
   72/42 = 72 × 27/42 × 27 = 1944/1134
3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
   84/81 = 84 × 14/81 × 14 = 1176/1134
4. Add the two like fractions:
   1944/1134 + 1176/1134 = 1944 + 1176/1134 = 3120/1134
5. 3120/1134 simplified gives 520/189
6. So, 72/42 + 84/81 = 520/189
   In mixed form: 2142/189

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