Answers

Add 36/21 and 54/81

1^st number: 1 15/21, 2^nd number: 54/81

36/21 + 54/81 is 50/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 81 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 21 × 27 = 567,
   36/21 = 36 × 27/21 × 27 = 972/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   54/81 = 54 × 7/81 × 7 = 378/567
4. Add the two like fractions:
   972/567 + 378/567 = 972 + 378/567 = 1350/567
5. 1350/567 simplified gives 50/21
6. So, 36/21 + 54/81 = 50/21
   In mixed form: 28/21

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