0.004
1) Since we have the following product:
To write it out into the Standard notation, let's multiply 4 by 10 to the negative third power like this:
2)
Note that 0.004 is the Standard Notation while 4 x 10^-3 is the Scientific Notation. And to divide 4 by 1000 we need to move that dot to the left (3 decimal places) for we have a negative exponent.
3) Hence, the answer is 0.004