Answers

Add 81/63 and 54/42

1^st number: 1 18/63, 2^nd number: 1 12/42

81/63 + 54/42 is 18/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 42 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 63 × 2 = 126,
   81/63 = 81 × 2/63 × 2 = 162/126
3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
   54/42 = 54 × 3/42 × 3 = 162/126
4. Add the two like fractions:
   162/126 + 162/126 = 162 + 162/126 = 324/126
5. 324/126 simplified gives 18/7
6. So, 81/63 + 54/42 = 18/7
   In mixed form: 24/7

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