Answers

Add 72/28 and 45/15

1^st number: 2 16/28, 2^nd number: 3 0/15

72/28 + 45/15 is 39/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 15 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 28 × 15 = 420,
   72/28 = 72 × 15/28 × 15 = 1080/420
3. Likewise, for the 2nd fraction, since 15 × 28 = 420,
   45/15 = 45 × 28/15 × 28 = 1260/420
4. Add the two like fractions:
   1080/420 + 1260/420 = 1080 + 1260/420 = 2340/420
5. 2340/420 simplified gives 39/7
6. So, 72/28 + 45/15 = 39/7
   In mixed form: 54/7

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