Answers

Add 21/5 and 75/81

1^st number: 4 1/5, 2^nd number: 75/81

21/5 + 75/81 is 692/135.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 5 and 81 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 5 × 81 = 405,
   21/5 = 21 × 81/5 × 81 = 1701/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   75/81 = 75 × 5/81 × 5 = 375/405
4. Add the two like fractions:
   1701/405 + 375/405 = 1701 + 375/405 = 2076/405
5. 2076/405 simplified gives 692/135
6. So, 21/5 + 75/81 = 692/135
   In mixed form: 517/135

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