0.000402
count from the decimal to just past the first whole number (4) and then remember that you are going right, which is a negative power ( include whole numbers, or numbers trapped by 0 )
4.02 X 10 -4
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1.03 x 105.
4 x 106
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".
This number in scientific notation is 9.8x10-5.