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Possible Duplicate:
Way to improve “show me this decimal number to M places, don't use scientific notation”?

How can I expand e.g. number 1.*10^-8 so that there would be no exponents? It should look like 0.00000001.

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marked as duplicate by Mr.Wizard Sep 15 '12 at 11:54

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Representation of numbers of handled with NumberForm. Choice of exponent to display is determined by its ExponentFunction option. If you never want an exponent displayed, this option should be a function that always returns Null, i.e. (Null &):

NumberForm[1.*10^-8, ExponentFunction -> (Null &)]
(* 0.00000001 *)
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Thank you! I was thinking that NumberForm might be the answer but I did not know how exactly do it. – Teemu Sep 15 '12 at 7:55
    
What if you always want to show the exponent? I am having problems transforming some numbers so that they show the exponents instead of the full number as in your output :\ applying only NumberForm[300000000,2] doesn't help. – Sosi Dec 3 '15 at 17:23

In addition to NumberForm, AccountingForm may be a useful shorthand:

AccountingForm[1.*10^-8]

0.00000001

Negative numbers are displayed (by default) in parentheses:

AccountingForm[-1.*10^-8]

(0.00000001)

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