Answers

Add 3/42 and 90/80

1^st number: 3/42, 2^nd number: 1 10/80

3/42 + 90/80 is 67/56.

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,
   3/42 = 3 × 40/42 × 40 = 120/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   90/80 = 90 × 21/80 × 21 = 1890/1680
4. Add the two like fractions:
   120/1680 + 1890/1680 = 120 + 1890/1680 = 2010/1680
5. 2010/1680 simplified gives 67/56
6. So, 3/42 + 90/80 = 67/56
   In mixed form: 111/56

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