Answers

Add 28/21 and 84/30

1^st number: 1 7/21, 2^nd number: 2 24/30

28/21 + 84/30 is 62/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 30 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 21 × 10 = 210,
   28/21 = 28 × 10/21 × 10 = 280/210
3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
   84/30 = 84 × 7/30 × 7 = 588/210
4. Add the two like fractions:
   280/210 + 588/210 = 280 + 588/210 = 868/210
5. 868/210 simplified gives 62/15
6. So, 28/21 + 84/30 = 62/15
   In mixed form: 42/15

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