"Das Mädchen kennt die Zahl nicht."

[dj1121]

Wouldn't you use Wissen in this case since it's a number? Hence, having knowledge.

"Das Mädchen wisst die Zahl nicht."

[wataya]

You mean "Das Mädchen weiß die Zahl nicht." Both "kennen" and "wissen" are fine here.

[dirron]

I think that you're wrong and that dj1121 is right. The difference between "kennen" and "wissen" is that "kennen" means "to know an object or person" and "wissen" is "to know a fact". This is a 'wissen' situation....

[Hohenems]

I second wataya. Depends on context. http://german.about.com/library/anfang/blanfang16b.htm

*Not a native speaker though, so my opinion could easily be disregarded.

[wataya]

No, as I said above: both are possible.

[Schnueffi]

Both are right, definitely. By the way, it's "Das Mädchen weiß die Zahl nicht" =)

[BGabel]

So this would mean the kind of number that would be the answer to a math problem? Whereas Nummer would mean phone number or address?

[bMVr]

Could this also mean "The girl does doesn't know how many"?

[siebolt]

I am not quite sure, but I think that the German sentence would have been "Das Mädchen kennt die Anzahl nicht."

[wataya]

Yes, or "Das Mädchen weiß nicht wie viele." Note that in this sentence you can't use 'kennen'.

[bMVr]

Thanks folks, that is helpful.

[lingding]

can Zahl also be translated to "the value"?

[siebolt]

No, that would be "den Wert"

[lingding]

ah ok, thanks!