Answers

Add 81/42 and 15/45

1^st number: 1 39/42, 2^nd number: 15/45

81/42 + 15/45 is 95/42.

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,
   15/45 = 15 × 14/45 × 14 = 210/630
4. Add the two like fractions:
   1215/630 + 210/630 = 1215 + 210/630 = 1425/630
5. 1425/630 simplified gives 95/42
6. So, 81/42 + 15/45 = 95/42
   In mixed form: 211/42

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