Answers

Add 28/84 and 12/72

28/84 + 12/72 is 1/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 84 × 6 = 504,
   28/84 = 28 × 6/84 × 6 = 168/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   12/72 = 12 × 7/72 × 7 = 84/504
4. Add the two like fractions:
   168/504 + 84/504 = 168 + 84/504 = 252/504
5. 252/504 simplified gives 1/2
6. So, 28/84 + 12/72 = 1/2

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