Answers

Add 28/84 and 15/12

1^st number: 28/84, 2^nd number: 1 3/12

28/84 + 15/12 is 19/12.

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,
   28/84 = 28 × 1/84 × 1 = 28/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   15/12 = 15 × 7/12 × 7 = 105/84
4. Add the two like fractions:
   28/84 + 105/84 = 28 + 105/84 = 133/84
5. 133/84 simplified gives 19/12
6. So, 28/84 + 15/12 = 19/12
   In mixed form: 17/12

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