All you have to do is find the largest number that you can divide evenly between the 2 set of numbers.
In this case it would be 3 and the largest exponential terms that you can take out without causing the exponents to become negative would be x^2 and y^1.
The 3 in 24,345 has a value of 300. A number 10 times that would have a value of 300*10 or 3,000. The 3 in choice C has a value of 3,000 so C is the right answer.
