8.2 × 105 written in regular notation is 820,000
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381.8 divided by 10 to the fifth power equals 0.003818
10 to the fifth power in scientific notation is expressed as 105
The standard notation of 10 to the fifth power is 105. That is also equal to one hundred thousand.
10th to the 5th power = (1/10) to the fifth power = (1/10)5 = (1/10)*(1/10)*(1/10)*(1/10)*(1/10) = 1/100,000 or 0.00001
10-5=0.0000001