Question about Candians..

[Sidoh]

There's a Canadian that lives a few rooms over, and he hates carrying one-dollar bills around; he prefers coins for whatever reason, so he actually goes to the bank and trades all of his ones in for Sacajawea dollar coins.

It's because he's Canadian!

i was talking about Deci, not Deca -- Deci = 1/10, and Deca/Deka = 10. 

I'm aware, but it seems to me that you were talking about both:

And nobody here ever used the deca prefix (or deci and hecti).  They exist for fun, I think.