How are the following recurring decimals related?

$0.22222222$ .....

$2.22222222$ ......

$22.22222222$ ......

$222.22222222$ ......

How are these recurring decimals related?

$0.2525252525$ ......
$2.5252525252$ ......
$25.252525252$ ......
$252.52525252525$ ......

Which pairs can be related by a sum and which pairs can be related by a multiplication?

The numbers $2.2222222$ ... and $2.525252525252$ ... can be written as a fractions. What are they?