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$\color{black}{1}$

$\color{black}{3km}$ $\color{black}{5m}$ $\color{black}{=}$ $\color{black}{3005m}$

$\color{black}{-}$ Km - Hm - Dam - m cách nhau 4 lần ta thêm 4 số 0 đằng sau

$\color{black}{2}$

$\color{black}{ Tấn}$ $\color{black}{3Kg}$ $\color{black}{=}$ $\color{black}{6003Kg}$

$\color{black}{3}$

$\dfrac{3}{5}$ $\color{black}{m}$ $\color{black}{=}$ $\color{black}{60cm}$