Answers

Add 9/42 and 84/72

1^st number: 9/42, 2^nd number: 1 12/72

9/42 + 84/72 is 29/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 42 × 12 = 504,
   9/42 = 9 × 12/42 × 12 = 108/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   84/72 = 84 × 7/72 × 7 = 588/504
4. Add the two like fractions:
   108/504 + 588/504 = 108 + 588/504 = 696/504
5. 696/504 simplified gives 29/21
6. So, 9/42 + 84/72 = 29/21
   In mixed form: 18/21

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