1$\text{ m}=100\text{ cm}\backslash m=100\backslash cm$

$300\text{ cm}=3m300\backslash cm=3m$

$1\min =60\text{ s}1\backslash min=60\backslash s$

$240\text{ s}=4\min 240\backslash s=4\backslash min$

$1\text{ l}=1000\text{ ml}1\backslash l=1000\backslash ml$

$\mathrm{0,8}\text{ l}=800\text{ ml}0\{,\}8\backslash l=800\backslash ml$