4.05 = 4.05×10^0
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405 can be written as 4.05 × 102 in scientific notation.
405,000 in Scientific Notation = 4.05 x 105
00405 is the same as 405 and in scientific notation it is: 4.05*102
It is 4.05*108
In scientific notation - it would be 5.22x106