Let's see how to multiple two numbers together that are in exponential notation.
Suppose we have: 2.0 x 102 * 3.0x103
First we multiply 2 x 3 to get 6.
Next we need to multiply 102 x 103. To do this we simply add the exponents!
So 2.0 x 102 * 3.0x103 = 6.0 x 105