Answers

Add 42/81 and 75/10

1^st number: 42/81, 2^nd number: 7 5/10

42/81 + 75/10 is 433/54.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 10 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 81 × 10 = 810,
   42/81 = 42 × 10/81 × 10 = 420/810
3. Likewise, for the 2nd fraction, since 10 × 81 = 810,
   75/10 = 75 × 81/10 × 81 = 6075/810
4. Add the two like fractions:
   420/810 + 6075/810 = 420 + 6075/810 = 6495/810
5. 6495/810 simplified gives 433/54
6. So, 42/81 + 75/10 = 433/54
   In mixed form: 81/54

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