Two rods with lengths 12.321cm and 10.3 cm and placed side by side. The difference in their lengths is

$$\begin{gathered} 12.321-10.3 \\ 12.32-10.3 (\mathrm{rounded} \mathrm{off} \mathrm{to} \mathrm{one} \mathrm{more} \mathrm{significant} \mathrm{digit} \mathrm{after} \mathrm{decimal} ) \\ 2.02=2.0 \left(\mathrm{after} \mathrm{rounding} \mathrm{off} \mathrm{to} \mathrm{one} \mathrm{digit} \mathrm{after} \mathrm{decimal}\right) \end{gathered}$$