4.0 × 10-2 written in standard notation is 0.040
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It is: 8.04*10^-9 = 0.00000000804
4.5 times 10 to the negative 2 power is calculated as 4.5 × 0.01, which equals 0.045. This represents moving the decimal point two places to the left, resulting in a value of 0.045.
If you mean 8.61*10^-8 then it is 0.0000000861
Your Windows calculator could have answered this for you... 0.000000000094