To solve for wavelength, I use this equation, with some values filled in (Excuse the lack of formatting, I am not aware on how to do this)

$$w = \frac{3.0 \times 10^8 m/s}{6.4 \times 10^{14} 1/s}$$

Without using a calculator, how can I easily divide $3.0 \times 10^8$ and $6.4 \times 10^{14}$? I have forgotten if $3.0 \times 10^8$ means $3$ followed by $8$ zeros, or $8$ in addition to the $3.0$? Or $3$ followed by $8$ zeros?