Write the expanded notation of the number.

$9000$ 

Write the number $8000+900+20+5$ in compact form.

Write the number $1000+400+4$ in compact form.

Write the number $5000+500+5$ in compact form.

Write the number $1000+7$ in compact form.

Write the number $5000+80+6$ in compact form.

Write $8000+700+2$ in compact form.

Arrange the following numbers in ascending order.

$2148, 2418, 2128, 2182$

Arrange the following numbers in ascending order.

$9400, 9490, 2940, 9460$