Answers

Add 90/84 and 18/54

1^st number: 1 6/84, 2^nd number: 18/54

90/84 + 18/54 is 59/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 54 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 84 × 9 = 756,
   90/84 = 90 × 9/84 × 9 = 810/756
3. Likewise, for the 2nd fraction, since 54 × 14 = 756,
   18/54 = 18 × 14/54 × 14 = 252/756
4. Add the two like fractions:
   810/756 + 252/756 = 810 + 252/756 = 1062/756
5. 1062/756 simplified gives 59/42
6. So, 90/84 + 18/54 = 59/42
   In mixed form: 117/42

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