How do you read them and is there any differences in American and British?
I am a native British English speaker who has worked in an engineering environment in the US. I do not recall these numbers being pronounced differently between continents.
I would say:
0.1 Oh point one -or- one tenth
0.24 Oh point two four
1 4/5 One and four fifths
(However I'm prepared to be corrected by other engineers with multinational experience)