Answers

Add 81/42 and 30/45

1^st number: 1 39/42, 2^nd number: 30/45

81/42 + 30/45 is 109/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 45 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   81/42 = 81 × 15/42 × 15 = 1215/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   30/45 = 30 × 14/45 × 14 = 420/630
4. Add the two like fractions:
   1215/630 + 420/630 = 1215 + 420/630 = 1635/630
5. 1635/630 simplified gives 109/42
6. So, 81/42 + 30/45 = 109/42
   In mixed form: 225/42

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