The given information is:
City A expects 3x10^5 people.
City B expects 6x10^4 people.
We can rewrite 3x10^5 as:
Because the power of ten lets us know the number of zeros we need to add at the right of the number 3.
Then, 6x10^4 can be rewritten as:
As you can see, 300000 is greater than 60000.
So city A is expecting more people to attend than city B.
If we divide the number of people city A is expecting by the number of people city B is expecting, we can know how many times as many people are expected in City A:
5 times as many people are expected.