Answers

Add 72/81 and 27/20

1^st number: 72/81, 2^nd number: 1 7/20

72/81 + 27/20 is 403/180.

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,
   72/81 = 72 × 20/81 × 20 = 1440/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   27/20 = 27 × 81/20 × 81 = 2187/1620
4. Add the two like fractions:
   1440/1620 + 2187/1620 = 1440 + 2187/1620 = 3627/1620
5. 3627/1620 simplified gives 403/180
6. So, 72/81 + 27/20 = 403/180
   In mixed form: 243/180

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