A number is said to be in standard form when it is written as a product of a number between 1 and 10 and a power of 10.
From the given options, the following are written correctly in standard form.
[tex]\begin{gathered} 4.51\times10^{-2} \\ 3.008\times10^{-8} \end{gathered}[/tex]
These are not written correctly in standard form.
[tex]\begin{gathered} 31.5\times10^2\text{ (31.5 is not between 1 and 10)} \\ 0.789\times10^5\text{ (0.789 is not between 1 and 10)} \end{gathered}[/tex]
