Express the following number in standard form.

$3,18,65,00,000$

$3,18,65,00,000$

$=3.1865\times 10,000\times 1,00,000$

$=3.1865\times {10}^4\times {10}^5$

$=3.1865\times {10}^{4+5}$       [$\because {\mathrm{a}}^{\mathrm{m}}\times {\mathrm{a}}^{\mathrm{n}}={\mathrm{a}}^{\mathrm{m}+\mathrm{n}}$]

$=3.1865\times {10}^9$

Therefore, $3,18,65,00,000=\mathbf{3}\mathbf{.}\mathbf{1865}\mathbf{\times }{\mathbf{10}}^{\mathbf{9}}$