Answers

Add 64/20 and 7/81

1^st number: 3 4/20, 2^nd number: 7/81

64/20 + 7/81 is 1331/405.

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,
   64/20 = 64 × 81/20 × 81 = 5184/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   7/81 = 7 × 20/81 × 20 = 140/1620
4. Add the two like fractions:
   5184/1620 + 140/1620 = 5184 + 140/1620 = 5324/1620
5. 5324/1620 simplified gives 1331/405
6. So, 64/20 + 7/81 = 1331/405
   In mixed form: 3116/405

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