Answers

Add 72/80 and 84/15

1^st number: 72/80, 2^nd number: 5 9/15

72/80 + 84/15 is 13/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 15 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 80 × 3 = 240,
   72/80 = 72 × 3/80 × 3 = 216/240
3. Likewise, for the 2nd fraction, since 15 × 16 = 240,
   84/15 = 84 × 16/15 × 16 = 1344/240
4. Add the two like fractions:
   216/240 + 1344/240 = 216 + 1344/240 = 1560/240
5. 1560/240 simplified gives 13/2
6. So, 72/80 + 84/15 = 13/2
   In mixed form: 61/2

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