You simply take the number of digits less one as the power, convert the number to a decimal between 0 and 10 and then note this decimal x 10 to the power calculated previously.
e.g.
1,000,000 in scientific notation is 1.0 x 106
123,000,000 in scientific notation is 1.23 x 108
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In the UK, you do nothing! The two notations are the same.
You will have a negative decimal. For example, -754 in scientific notation is -7.54*10^2.
Scientific notations do not care about the range of the number in question but do so about its precision. Therefore the notation for the given number will be - 7.53 X 102
1.79 × 102g
in scientific notation is 2.02 x 10^-7