Answers

Add 18/84 and 45/12

1^st number: 18/84, 2^nd number: 3 9/12

18/84 + 45/12 is 111/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 12 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 84 × 1 = 84,
   18/84 = 18 × 1/84 × 1 = 18/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   45/12 = 45 × 7/12 × 7 = 315/84
4. Add the two like fractions:
   18/84 + 315/84 = 18 + 315/84 = 333/84
5. 333/84 simplified gives 111/28
6. So, 18/84 + 45/12 = 111/28
   In mixed form: 327/28

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