Answers

Add 75/20 and 8/81

1^st number: 3 15/20, 2^nd number: 8/81

75/20 + 8/81 is 1247/324.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   75/20 = 75 × 81/20 × 81 = 6075/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   8/81 = 8 × 20/81 × 20 = 160/1620
4. Add the two like fractions:
   6075/1620 + 160/1620 = 6075 + 160/1620 = 6235/1620
5. 6235/1620 simplified gives 1247/324
6. So, 75/20 + 8/81 = 1247/324
   In mixed form: 3275/324

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