Multiplying and Dividing with Negative
Numbers
The multiply/divide sign rule:
 If the 2 numbers you are multiplying or dividing
have the SAME
sign (+,+ or ,) then the result is POSITIVE
 If the 2 numbers you are multiplying or dividing
have DIFFERENT
signs (+, or ,+) then the result is NEGATIVE.
Here's another way of saying this....
Examples:

Multiply 
Divide 


SAME ==> 
5 x 5 = +25 
8/4 = +2 
<== SAME 
DIFFERENT ==> 
5 x +5 = 25 
8/+4 = 2 
<== DIFFERENT 
SAME ==> 
+5 x +5 = +25 
+8/+4 = +2 
<== SAME 
DIFFERENT ==> 
+5 x 5 = 25 
+8/4 = 2 
<== DIFFERENT 
Sometimes you have to subtract a negative number or add one, like
this:
+8  4 or +8 + 4
Here, you have 2 signs together.
If you have 2 signs together, then you can replace the 2 signs with 1 sign
using the multiply/divide rule.
Examples: