Express the following number in expanded form.

$10101010101$

Express the following number in expanded form.

$4913000$

Express the following number in expanded form.

$27000000000$

Convert $300 km$ into $cm$ and express the answer in the standard form.

Convert $2568 kg$ into $g$ and express the answer in the standard form.

Find the number from the following.

$5.0\times {10}^{11}$

Find the number from the following.

$1.385\times {10}^5$

Find the number from the following.

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

Find the number from the following.

$8\times {10}^{12}+7\times {10}^9+6\times {10}^8+5\times {10}^6+4\times {10}^4+3\times {10}^3+2\times 10+1$