Answers

Add 81/42 and 70/64

1^st number: 1 39/42, 2^nd number: 1 6/64

81/42 + 70/64 is 677/224.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 64 is 1344
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1344
2. For the 1st fraction, since 42 × 32 = 1344,
   81/42 = 81 × 32/42 × 32 = 2592/1344
3. Likewise, for the 2nd fraction, since 64 × 21 = 1344,
   70/64 = 70 × 21/64 × 21 = 1470/1344
4. Add the two like fractions:
   2592/1344 + 1470/1344 = 2592 + 1470/1344 = 4062/1344
5. 4062/1344 simplified gives 677/224
6. So, 81/42 + 70/64 = 677/224
   In mixed form: 35/224

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