Answers

Add 72/15 and 27/84

1^st number: 4 12/15, 2^nd number: 27/84

72/15 + 27/84 is 717/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 15 × 28 = 420,
   72/15 = 72 × 28/15 × 28 = 2016/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   27/84 = 27 × 5/84 × 5 = 135/420
4. Add the two like fractions:
   2016/420 + 135/420 = 2016 + 135/420 = 2151/420
5. 2151/420 simplified gives 717/140
6. So, 72/15 + 27/84 = 717/140
   In mixed form: 517/140

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