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**How can you multiply by a negative times of a no.??**

Is there an intuitive explanation existing for this kind of a problem?

I found these websites but none offer me an intuitive explanation:

http://mathforum.org/library/drmath/view/57865.html

http://mathlesstraveled.com/2009/09/29/minus-times-minus-is-plus/

http://www.mathsisfun.com/multiplying-negatives.html