Answers

Add 21/42 and 90/16

1^st number: 21/42, 2^nd number: 5 10/16

21/42 + 90/16 is 49/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 16 is 336
   
   Next, find the equivalent fraction of both fractional numbers with denominator 336
2. For the 1st fraction, since 42 × 8 = 336,
   21/42 = 21 × 8/42 × 8 = 168/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   90/16 = 90 × 21/16 × 21 = 1890/336
4. Add the two like fractions:
   168/336 + 1890/336 = 168 + 1890/336 = 2058/336
5. 2058/336 simplified gives 49/8
6. So, 21/42 + 90/16 = 49/8
   In mixed form: 61/8

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