One millilitre has about $15$ drops. One drop of water has $1.67\times {10}^{21}{\mathrm{H}}_2\mathrm{O}$ (water) molecules. Estimate the number of molecules in $1$ litre of water. Write down your answer in standard form.

Convert the following into millilitres.

$2 \mathrm{L}$

If $83 \mathrm{mm}$ can be expressed in decimal as $\mathrm{A} \mathrm{cm}$, then find the value of $A$.

Convert into $\mathrm{cm}$.

$33 \mathrm{m}$

Convert the following into millilitres.

$6 \mathrm{L} 372 \mathrm{mL}$

Convert the following into millilitres.

$8 \mathrm{L}$

If $2 \mathrm{mm}$ is expressed as $k \mathrm{cm}$ using decimals, then write the value of $k$.

Number of metres in $\frac{3}{4}$ kilometre $=$ _____ metres

Convert the following into millilitres.

$5 \mathrm{L} 136 \mathrm{mL}$

Number of millimetres in $\frac{1}{2}$ centimetre $=$ _____ millimetres.