Answers

Add 81/42 and 2/90

1^st number: 1 39/42, 2^nd number: 2/90

81/42 + 2/90 is 1229/630.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 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 90 × 7 = 630,
   2/90 = 2 × 7/90 × 7 = 14/630
4. Add the two like fractions:
   1215/630 + 14/630 = 1215 + 14/630 = 1229/630
5. So, 81/42 + 2/90 = 1229/630
   In mixed form: 1599/630

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