Answers

Add 16/21 and 84/72

1^st number: 16/21, 2^nd number: 1 12/72

16/21 + 84/72 is 27/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 21 × 24 = 504,
   16/21 = 16 × 24/21 × 24 = 384/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   84/72 = 84 × 7/72 × 7 = 588/504
4. Add the two like fractions:
   384/504 + 588/504 = 384 + 588/504 = 972/504
5. 972/504 simplified gives 27/14
6. So, 16/21 + 84/72 = 27/14
   In mixed form: 113/14

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