If the age of the universe, which is about $\mathrm{12,000,000,000}$ years, is expressed in standard form, we get $1.2\times {10}^m$ years, then find the value of $m$.

Write the following number in the expanded exponential form

$20068$

Write the following number in the expanded exponential form

$420719$

Write the following number in the expanded exponential form

$7805192$

Write the following numbers in the expanded exponential forms:

$5004132$

Write the following number in the expanded exponential form

$927303$

Find the number from the following expanded form.

$7\times {10}^4+6\times {10}^3+0\times {10}^2+4\times {10}^1+5\times {10}^0$

Find the number from the following expanded form

$5\times {10}^5+4\times {10}^4+2\times {10}^3+3\times {10}^0$

Find the number from the following expanded form:

$9\times {10}^5+5\times {10}^2+3\times {10}^1$