[schiederme]

Knowingly just once, where the project required to calculate roof space (for solar installation).

Other then that, no.

Maths is important. But most of the times only for low level stuff.

I would say, that you should be able to understand a math problem and solution based on the first few pages of a Google search. I would rather hire a person, that sucks at math but can understand the basics of most things in 5minutes.