Answers

Add 54/21 and 90/16

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

54/21 + 90/16 is 459/56.

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,
   54/21 = 54 × 16/21 × 16 = 864/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   90/16 = 90 × 21/16 × 21 = 1890/336
4. Add the two like fractions:
   864/336 + 1890/336 = 864 + 1890/336 = 2754/336
5. 2754/336 simplified gives 459/56
6. So, 54/21 + 90/16 = 459/56
   In mixed form: 811/56

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