Answers

Add 81/21 and 70/16

1^st number: 3 18/21, 2^nd number: 4 6/16

81/21 + 70/16 is 461/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 16 is 336
   
   Next, find the equivalent fraction of both fractional numbers with denominator 336
2. For the 1st fraction, since 21 × 16 = 336,
   81/21 = 81 × 16/21 × 16 = 1296/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   70/16 = 70 × 21/16 × 21 = 1470/336
4. Add the two like fractions:
   1296/336 + 1470/336 = 1296 + 1470/336 = 2766/336
5. 2766/336 simplified gives 461/56
6. So, 81/21 + 70/16 = 461/56
   In mixed form: 813/56

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