Answers

Add 72/81 and 90/30

1^st number: 72/81, 2^nd number: 3 0/30

72/81 + 90/30 is 35/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 30 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 81 × 10 = 810,
   72/81 = 72 × 10/81 × 10 = 720/810
3. Likewise, for the 2nd fraction, since 30 × 27 = 810,
   90/30 = 90 × 27/30 × 27 = 2430/810
4. Add the two like fractions:
   720/810 + 2430/810 = 720 + 2430/810 = 3150/810
5. 3150/810 simplified gives 35/9
6. So, 72/81 + 90/30 = 35/9
   In mixed form: 38/9

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