1.0 x 10^3 1.0 x 10^4 1.0 x 10^-3 1.0 x 10^-4
I gave my students this multiple choice question: The following mathematical expressions represent four different concentrations of a chemical solution to be used in a science experiment. Which one is equal in magnitude to 1/1000?

Only one answer is correct among these 4 choices:
- 1.0 x 10^3
- 1.0 x 10^4
- 1.0 x 10^-3
- 1.0 x 10^-4

Could you tell me which one is correct?

1.0 x 10^-3