Fixing a number at a certain precission?

[veryhappy]

I've a polynomial and i need to find the roots (that should be complex
conjugated pairs) and then use cplxpair to join each pair in second order
polynomials but i find that, due to rounding errors, roots aren't well
paired and cplxpair throw an error. I've tried to set a tol for cplxpair but
that makes imaginary numbers appear in the polynomials i want to find.
I've determinated that at least twelve decimal positions are correct so i
would like to fix the numbers i get at that precision. What's the best
method to do this? Multiply the number for 1e12 then fix it and lastly
divide by 1e12 or there's a better way?

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