Answers

Add 81/72 and 35/15

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

81/72 + 35/15 is 83/24.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 15 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   81/72 = 81 × 5/72 × 5 = 405/360
3. Likewise, for the 2nd fraction, since 15 × 24 = 360,
   35/15 = 35 × 24/15 × 24 = 840/360
4. Add the two like fractions:
   405/360 + 840/360 = 405 + 840/360 = 1245/360
5. 1245/360 simplified gives 83/24
6. So, 81/72 + 35/15 = 83/24
   In mixed form: 311/24

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