automatic numbering 10er steps

Hi all

Do you know if there is any possibility in the automatic numbering of paragraphs to automattically make 10er steps. Like:

2.10

2.20

2.30

2.40

I have only found the <n+> function but not any function like <n+x> and <n= X> but the latter is no help as I have over 100 paragraphs like that.

Thank you