Answers

Add 63/12 and 42/81

1^st number: 5 3/12, 2^nd number: 42/81

63/12 + 42/81 is 623/108.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 81 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 12 × 27 = 324,
   63/12 = 63 × 27/12 × 27 = 1701/324
3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
   42/81 = 42 × 4/81 × 4 = 168/324
4. Add the two like fractions:
   1701/324 + 168/324 = 1701 + 168/324 = 1869/324
5. 1869/324 simplified gives 623/108
6. So, 63/12 + 42/81 = 623/108
   In mixed form: 583/108

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