Answers

Add 75/21 and 90/16

1^st number: 3 12/21, 2^nd number: 5 10/16

75/21 + 90/16 is 515/56.

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,
   75/21 = 75 × 16/21 × 16 = 1200/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   90/16 = 90 × 21/16 × 21 = 1890/336
4. Add the two like fractions:
   1200/336 + 1890/336 = 1200 + 1890/336 = 3090/336
5. 3090/336 simplified gives 515/56
6. So, 75/21 + 90/16 = 515/56
   In mixed form: 911/56

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