Answers

Add 40/81 and 72/10

1^st number: 40/81, 2^nd number: 7 2/10

40/81 + 72/10 is 3116/405.

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,
   40/81 = 40 × 10/81 × 10 = 400/810
3. Likewise, for the 2nd fraction, since 10 × 81 = 810,
   72/10 = 72 × 81/10 × 81 = 5832/810
4. Add the two like fractions:
   400/810 + 5832/810 = 400 + 5832/810 = 6232/810
5. 6232/810 simplified gives 3116/405
6. So, 40/81 + 72/10 = 3116/405
   In mixed form: 7281/405

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