Answers

Add 21/81 and 30/20

1^st number: 21/81, 2^nd number: 1 10/20

21/81 + 30/20 is 95/54.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 20 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   21/81 = 21 × 20/81 × 20 = 420/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   30/20 = 30 × 81/20 × 81 = 2430/1620
4. Add the two like fractions:
   420/1620 + 2430/1620 = 420 + 2430/1620 = 2850/1620
5. 2850/1620 simplified gives 95/54
6. So, 21/81 + 30/20 = 95/54
   In mixed form: 141/54

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