>> Most people would consider that you need a calculator to do any
>> computations in base 10, beyond really trivial ones.
>
> Trivial, like multiplying 2 random phone numbers in your head? :P
> I've done that several times, just for the /fun/...
> Take some random 10 digits number, then another random 7 digit number.
> OK. Now, without paper, what is the product? Hint, it's 17 digit long,
> possibly 18. Your pocket calculator can't give you the exact result.

Now, personally, I can't even *remember* a 17 digit number without 
pencil and paper, never mind *compute* it. :-P

-- 
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