Answers

Add 72/21 and 35/84

1^st number: 3 9/21, 2^nd number: 35/84

72/21 + 35/84 is 323/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 84 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   72/21 = 72 × 4/21 × 4 = 288/84
3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
   35/84 = 35 × 1/84 × 1 = 35/84
4. Add the two like fractions:
   288/84 + 35/84 = 288 + 35/84 = 323/84
5. So, 72/21 + 35/84 = 323/84
   In mixed form: 371/84

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