Answers

Add 72/28 and 40/81

1^st number: 2 16/28, 2^nd number: 40/81

72/28 + 40/81 is 1738/567.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 81 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 28 × 81 = 2268,
   72/28 = 72 × 81/28 × 81 = 5832/2268
3. Likewise, for the 2nd fraction, since 81 × 28 = 2268,
   40/81 = 40 × 28/81 × 28 = 1120/2268
4. Add the two like fractions:
   5832/2268 + 1120/2268 = 5832 + 1120/2268 = 6952/2268
5. 6952/2268 simplified gives 1738/567
6. So, 72/28 + 40/81 = 1738/567
   In mixed form: 337/567

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