Just to wrap this up, it wasn't a question about what does 1024 mean...what does binary mean...why are you multiplying, dividing, carrying the 1 (don't take the last one literally), but a question about why Cox need to use 2 numbering systems on this page. If Cox needs to use 2 different systems, Cox needs to clarify it.
This convo was productive to me. I shouldn't have asked "why" on numerical replies but instead a generalized "why" do we need to convert in the first place. I shouldn't have been so coy to force an overall question. I'll chalk it as another lesson on accuracy, brevity and clarity.