I hope it helps:
The good thing about scientific notation is that you do not need to deal with a lot of zeros and the operations are quite simplified. The problem is that you need to remember some rules of exponents!
In your case you have a multiplication that can be written as:
here you take advantage of the fact that the order in the multiplication is irrelevant.
The first multiplication is easy to do while the second can be solved remembering that:
so, basically, if the base is the same (
your number then becomes:
Consider a division now and see, by yourself, what will be the result!