Answers

Add 56/81 and 35/20

1^st number: 56/81, 2^nd number: 1 15/20

56/81 + 35/20 is 791/324.

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,
   56/81 = 56 × 20/81 × 20 = 1120/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   35/20 = 35 × 81/20 × 81 = 2835/1620
4. Add the two like fractions:
   1120/1620 + 2835/1620 = 1120 + 2835/1620 = 3955/1620
5. 3955/1620 simplified gives 791/324
6. So, 56/81 + 35/20 = 791/324
   In mixed form: 2143/324

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