What does it mean when you are asked to specify artwork scale?

So I am preparing a couple of small adverts and the specifications for the artwork ask that :

"Please specify which scale ie. 10% 25% 50%, and as individual artworks ie. Panel A, Panel B etc..."

So my question is what does this mean?

I must admit I lack print experience and have never come across this requirement before, however despite quite a bit of goggling I wasnt able to find out what this means.

does it mean that if I have a document that is 500x500mm, 300dpi, CMYK (Which is what they asked for) its 100% resolution?

Apologies if this is a noob question but I just cant find any other sources on the web.