Answers

Add 15/10 and 20/81

1^st number: 1 5/10, 2^nd number: 20/81

15/10 + 20/81 is 283/162.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 81 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 10 × 81 = 810,
   15/10 = 15 × 81/10 × 81 = 1215/810
3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
   20/81 = 20 × 10/81 × 10 = 200/810
4. Add the two like fractions:
   1215/810 + 200/810 = 1215 + 200/810 = 1415/810
5. 1415/810 simplified gives 283/162
6. So, 15/10 + 20/81 = 283/162
   In mixed form: 1121/162

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