Answers

Add 84/42 and 18/90

1^st number: 2 0/42, 2^nd number: 18/90

84/42 + 18/90 is 11/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   84/42 = 84 × 15/42 × 15 = 1260/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   18/90 = 18 × 7/90 × 7 = 126/630
4. Add the two like fractions:
   1260/630 + 126/630 = 1260 + 126/630 = 1386/630
5. 1386/630 simplified gives 11/5
6. So, 84/42 + 18/90 = 11/5
   In mixed form: 21/5

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