RE: [xmca] a minus times a plus

["Duvall, Emily" <emily@uidaho.edu>]

My non-math vision. 
If I multiply a positive number by 0, I still have 0.
If I multiply a positive number by less than 0, a negative number, I
will still have less than 0... only it will be a more specific amount of
less than zero.
Ergo multiply a positive number by a negative number and it will have to
be a negative result.
~em
P.S. I teaching reading. 


-----Original Message-----
From: xmca-bounces@weber.ucsd.edu [mailto:xmca-bounces@weber.ucsd.edu]
On Behalf Of Mike Cole
Sent: Monday, April 27, 2009 3:48 PM
To: eXtended Mind, Culture, Activity
Subject: [xmca] a minus times a plus

Since we have some mathematically literate folks on xmca, could someone
please post an explanation of why

multiplying a negative number by a positive numbers yields a negative
number? What I would really love is an explanation
that is representable in a manner understandable to old college
professors
and young high school students alike.

mike
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