Answers

Add 5/21 and 5/4

1^st number: 5/21, 2^nd number: 1 1/4

5/21 + 5/4 is 125/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 4 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   5/21 = 5 × 4/21 × 4 = 20/84
3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
   5/4 = 5 × 21/4 × 21 = 105/84
4. Add the two like fractions:
   20/84 + 105/84 = 20 + 105/84 = 125/84
5. So, 5/21 + 5/4 = 125/84
   In mixed form: 141/84

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