Question

Witch is the correct scientific notation of the number 0.000681?

A. 68.1 x 10-4

B. 6.81 x 104

C. 6.81 x 10-4

D. 6.81 x 10-5

E. 68.1 x 10-4

Answer 1

C. 6.81x10^-4
It is negative 4 because the 6 is 4 digits away from the first 0.
Scientific notation has one number and then the decimal place so it can not be A or E.