Answers

Add 90/84 and 54/18

1^st number: 1 6/84, 2^nd number: 3 0/18

90/84 + 54/18 is 57/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 18 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 84 × 3 = 252,
   90/84 = 90 × 3/84 × 3 = 270/252
3. Likewise, for the 2nd fraction, since 18 × 14 = 252,
   54/18 = 54 × 14/18 × 14 = 756/252
4. Add the two like fractions:
   270/252 + 756/252 = 270 + 756/252 = 1026/252
5. 1026/252 simplified gives 57/14
6. So, 90/84 + 54/18 = 57/14
   In mixed form: 41/14

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