How do you convert 45 centimeters to kilometers?

$54$ cm $= 5.4 \times {10}^{- 4}$ km
$100$ cm $= 1$ m $\rightarrow 1$ cm$= {10}^{- 2}$ m
$1000$ m $= 1$ km $\rightarrow 1$ m $= {10}^{- 3}$ km $\rightarrow 1$ cm $= {10}^{- 5}$ km
$54$ cm $= 54 \times {10}^{- 5}$ km $= 5.4 \times {10}^{- 4}$ km