Answers

Add 81/42 and 10/80

1^st number: 1 39/42, 2^nd number: 10/80

81/42 + 10/80 is 115/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   81/42 = 81 × 40/42 × 40 = 3240/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   10/80 = 10 × 21/80 × 21 = 210/1680
4. Add the two like fractions:
   3240/1680 + 210/1680 = 3240 + 210/1680 = 3450/1680
5. 3450/1680 simplified gives 115/56
6. So, 81/42 + 10/80 = 115/56
   In mixed form: 23/56

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