To multiply or divide signed numbers, treat them just like regular numbers but remember this rule: An odd number of negative signs will produce a negative answer; an even number of negative signs will produce a positive answer.

For example:

(-3)(+8)(-5)(-1)(-2) = +240

(-3)(+8)(-1)(-2) = -48

-64/-2 = +32

-64/2 = -32