Question 21870
The first rule for scientific notation is that the number (significant figure) has to be between 1 and 10
So, your first number must be {{{4.09}}}
Then, you add the traditional {{{10^x}}}
Then count how many spaces to the right you moved the decimal. (4)
Since you moved it to the right, your exponent after the 10 will be negative 4
So, your answer in scientific notation is {{{4.09*10^-4}}}
Hope this helps!