The rules for multiplication and division are exactly the same: multiply and divide the numbers as normal. If the signs are the same the answer is positive. If the signs are different, the answer is negative.
|Positive||(x) or (÷)||positive||=||positive|
|Positive||(x) or (÷)||negative||=||negative|
|Negative||(x) or (÷)||positive||=||negative|
|Negative||(x) or (÷)||negative||=||positive|
Yep, two wrongs (negatives) actually do make a right (positive).
Here is one way to visualize this: if you take a video of someone walking backward (a negative), then play the video in reverse (another negative), the person will be walking forward (in the positive direction).
Think of someone you consider to be a good guy (like Batman) and someone who is a bad guy (like the Joker). Next, ask these questions: