Answers

Add 81/10 and 30/80

1^st number: 8 1/10, 2^nd number: 30/80

81/10 + 30/80 is 339/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 10 × 8 = 80,
   81/10 = 81 × 8/10 × 8 = 648/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   30/80 = 30 × 1/80 × 1 = 30/80
4. Add the two like fractions:
   648/80 + 30/80 = 648 + 30/80 = 678/80
5. 678/80 simplified gives 339/40
6. So, 81/10 + 30/80 = 339/40
   In mixed form: 819/40

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