Standard form

In standard form, write the first number so that it is at least 1 but less than 10; for example, $0.000004\,\text{m}=4\times10^{-6}\,\text{m}$.

For standard form, write the number as $a\times10^n$, where $1\leq a<10$.

For standard form, move the decimal point rather than just counting zeros. The number before $\times 10^n$ must be at least 1 and less than 10.