How do you write #4.2 * 10^-4# in standard form?
In scientific notation, we write a number so that it has single digit to the left of decimal sign and is multiplied by an integer power of
In other words, in scientific notation, a number is written as
To write the number in normal or standard notation one just needs to multiply by the power
In the given case, as we have the number as
Hence in standard notation