Answers

Add 90/8 and 42/84

1^st number: 11 2/8, 2^nd number: 42/84

90/8 + 42/84 is 47/4.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 84 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 8 × 21 = 168,
   90/8 = 90 × 21/8 × 21 = 1890/168
3. Likewise, for the 2nd fraction, since 84 × 2 = 168,
   42/84 = 42 × 2/84 × 2 = 84/168
4. Add the two like fractions:
   1890/168 + 84/168 = 1890 + 84/168 = 1974/168
5. 1974/168 simplified gives 47/4
6. So, 90/8 + 42/84 = 47/4
   In mixed form: 113/4

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