mathematics - Divide an integer by 2 by replacing 9 with 0

What are examples of integers that halve their values when all 9's in their decimal representations are replaced with 0's?

Answer

Not the usual decimal representation, but...

$1.9999999....$ is double $1.00000...$

I originally did not point this out as to not complicate the answer, but we can make as many examples as we want:

Just move the decimal point in the previous answer to the right:
$19.999999....$ is double $10.0000...$
$199.99999....$ is double $100.000...$
and so on.