Khan Academy Static

In this section we will see what happens when we multiply two integers, and how their signs affect the result. For example, a negative times a negative is a positive but positive times a negative is a negative.

8319_Multiplying_positive_negative_numbers.html

8320_Why_a_negative_times_a_negative_is_a_positive.html

8321_Why_a_negative_times_a_negative_makes_sense.html