For a standard form, the decimal point must be after the first non-zero digit.

It is expressed in the form a.bcd x 10ⁿ.

Where n is the number of moves of the decimal point to be after the first non-zero digit.

In order to know the value of n, you have to count how many digits you have to move the decimal point over.

When you move the decimal point to the right, the n is negated but if you have to move the decimal point to the left, the n is positive.

0.01723 = 0.⌒0⌒1.723 = 1.723 x 10^-2

A standard form should be in the form a.bcdef x 10^g

Thus the decimal must be after the first non-zero number.

The power is the number of times you have to move the decimal point so that it's positioned after the first non-zero number

If you move to the left, the power is positive and if you move to the right, the power is negative

From 1930.54 you can see that the decimal must be after 1. We have to move the current decimal point three (3) times to the left in order to position it after the 1, hence the power is positive 3

1930.54 = 1.93054 x 10³