2 x 10-1 = 0.2
The negative powers are the reciprocals of the positive powers:
10-1 is the same as 1/101
10-2 is the same as 1/102
etc
So:
2 x 10-1 = 2 x 1/101
= 2 x 1/10
= 2 / 10
= 0.2
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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.
4.0 × 10-2 written in standard notation is 0.040
If you mean 8.61*10^-8 then it is 0.0000000861