Daryl wrote --
 
>   I'll never be as good as my late father was, but I can do quite
> a few calculations in my head. 

  I worked with a fella one time who used an adding machine and then in his
head a long list of figures.
  I asked him one time why he did it both ways and he replied he counted
all the numbers to make sure the adding machine was right.  :)   
  Joe
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