$1\text{ cm}=\mathrm{0,01}\text{ m}1\backslash cm=0\{,\}01\backslash m$ $\Rightarrow \backslash Rightarrow$ $250\text{ cm}=\mathrm{2,5}\text{ m}250\backslash cm=2\{,\}5\backslash m$

$1\text{ l}=1{\text{ dm}}^{3}1\backslash l=1\backslash dm^3$ $\Rightarrow \backslash Rightarrow$ $\mathrm{0,75}\text{ l}=\mathrm{0,75}{\text{ dm}}^{3}0\{,\}75\backslash l=0\{,\}75\backslash dm^3$

$1\text{ h}=60\min 1\backslash h=60\backslash min$ $\Rightarrow \backslash Rightarrow$ $\mathrm{2,5}\text{ h}=\mathrm{2,5}\cdot 60\min =150\min 2\{,\}5\backslash h=2\{,\}5\backslash cdot\; 60\backslash min=150\backslash min$