Answers

Add 8/21 and 28/9

1^st number: 8/21, 2^nd number: 3 1/9

8/21 + 28/9 is 220/63.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 9 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 21 × 3 = 63,
   8/21 = 8 × 3/21 × 3 = 24/63
3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
   28/9 = 28 × 7/9 × 7 = 196/63
4. Add the two like fractions:
   24/63 + 196/63 = 24 + 196/63 = 220/63
5. So, 8/21 + 28/9 = 220/63
   In mixed form: 331/63

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