Answers

Add 84/42 and 9/80

1^st number: 2 0/42, 2^nd number: 9/80

84/42 + 9/80 is 169/80.

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,
   84/42 = 84 × 40/42 × 40 = 3360/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
4. Add the two like fractions:
   3360/1680 + 189/1680 = 3360 + 189/1680 = 3549/1680
5. 3549/1680 simplified gives 169/80
6. So, 84/42 + 9/80 = 169/80
   In mixed form: 29/80

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