Write the following numbers in the expanded form using exponential notation.

$343, 5102, 9868609, 134087, 89764532$

Write the number for the following expanded form.

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

Write the number for the following expanded form.

$9\times {10}^4+8\times {10}^3+2\times {10}^1+5\times {10}^0$

Write the number for the following expanded form.

$3\times {10}^5+9\times {10}^2+6\times {10}^1+9\times {10}^0$

Write the number for the following expanded form.

$8\times {10}^6+4\times {10}^4+5\times {10}^0$

Express the following number in the standard form.

$156$

Express the following number in the standard form.

Express the following number in the standard form.

Express the following number in the standard form.