Answers

Add 90/42 and 90/80

1^st number: 2 6/42, 2^nd number: 1 10/80

90/42 + 90/80 is 183/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   90/42 = 90 × 40/42 × 40 = 3600/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   90/80 = 90 × 21/80 × 21 = 1890/1680
4. Add the two like fractions:
   3600/1680 + 1890/1680 = 3600 + 1890/1680 = 5490/1680
5. 5490/1680 simplified gives 183/56
6. So, 90/42 + 90/80 = 183/56
   In mixed form: 315/56

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