Answers

Add 1/84 and 90/80

1^st number: 1/84, 2^nd number: 1 10/80

1/84 + 90/80 is 191/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   1/84 = 1 × 20/84 × 20 = 20/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   90/80 = 90 × 21/80 × 21 = 1890/1680
4. Add the two like fractions:
   20/1680 + 1890/1680 = 20 + 1890/1680 = 1910/1680
5. 1910/1680 simplified gives 191/168
6. So, 1/84 + 90/80 = 191/168
   In mixed form: 123/168

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