You move the decimal left or right until you end up with one digit in front of the decimal. Then, if you had to move the decimal to the left to get this number, you will have ten to the positive power of the number of decimal places moved.
If you had to move the decimal to the right to get the number, you will have ten to the negative power of the number of decimal places moved.
In this example, 5217000000 = 5.217 x 109
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The standard number 0.09 in scientific notation is: 9 × 10-2
It is one of the great ironies of Mathematics that "standard" is not standard. In the US, standard notation is a number, like 953, which would be written in scientific notation as 9.53 x 10^2 In Britain, scientific notation is also known as "standard form."
It is: 3.992*10^11 in scientific notation
0.9 in scientific notation is 9.0*10*^-1
28.6 is the standard notation. The standard form(also called scientific notation) is: 2.86 × 101