Answers

Add 72/21 and 16/9

1^st number: 3 9/21, 2^nd number: 1 7/9

72/21 + 16/9 is 328/63.

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,
   72/21 = 72 × 3/21 × 3 = 216/63
3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
   16/9 = 16 × 7/9 × 7 = 112/63
4. Add the two like fractions:
   216/63 + 112/63 = 216 + 112/63 = 328/63
5. So, 72/21 + 16/9 = 328/63
   In mixed form: 513/63

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