It is: 5.42*10-4 = 0.000542 by moving the decimal point 4 places to the left
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750,000 is the standard notation.
1.76*103IS in standard notation.
25,700,000 is the standard notation. The scientific notation is: 2.57 x 10^7
The way you wrote it is the standard notation. Standard notation means to write the number in its standard form. So, a number such as 150 is simply written as 150 in standard notation. The same applies to decimals.
9.11*103 IS in standard notation.