Best way to store numeric data?

[Galen]

I've got a huge table going, and it's storing a load of numeric data. 
Basically, a percentage or single digit rank, one or two digits before 
the decimal and fifteen after, like this:

6.984789027653891
39.484789039053891
What is the most efficient way to store these values? I will be 
frequently sorting results by them or using math with them, so speed is 
important, but I also don't want to be wasteful of disk space as I 
currently have over three quarters of a million records, with more to 
come.

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