Answers

Add 81/18 and 81/42

1^st number: 4 9/18, 2^nd number: 1 39/42

81/18 + 81/42 is 45/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 42 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   81/18 = 81 × 7/18 × 7 = 567/126
3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
   81/42 = 81 × 3/42 × 3 = 243/126
4. Add the two like fractions:
   567/126 + 243/126 = 567 + 243/126 = 810/126
5. 810/126 simplified gives 45/7
6. So, 81/18 + 81/42 = 45/7
   In mixed form: 63/7

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