Answers

Add 7/2 and 20/21

1^st number: 3 1/2, 2^nd number: 20/21

7/2 + 20/21 is 187/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 2 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 2 × 21 = 42,
   7/2 = 7 × 21/2 × 21 = 147/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   20/21 = 20 × 2/21 × 2 = 40/42
4. Add the two like fractions:
   147/42 + 40/42 = 147 + 40/42 = 187/42
5. So, 7/2 + 20/21 = 187/42
   In mixed form: 419/42

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