Answers

Add 28/15 and 21/12

1^st number: 1 13/15, 2^nd number: 1 9/12

28/15 + 21/12 is 217/60.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 12 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 15 × 4 = 60,
   28/15 = 28 × 4/15 × 4 = 112/60
3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
   21/12 = 21 × 5/12 × 5 = 105/60
4. Add the two like fractions:
   112/60 + 105/60 = 112 + 105/60 = 217/60
5. So, 28/15 + 21/12 = 217/60
   In mixed form: 337/60

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