From YouTube, produced by The Math Party National Standards Program

This video is from The Math Party National Standards Program and features a catchy tune to help students remember the rules of multiplying positive and negative numbers.

This video illustrates how to multiply integers, as used in basic high school Math courses. Good sound quality. Instructor uses camera that is focused on his paper for demonstration.

The instructor show how to multiply negative integers with specific examples using computer software. The sound of the instructor's voice is a little low, but understandable. However, the voice may not be heard in a large classroom.

From YouTube, produced by Lawrence Perez/Candice Jhu

This video starts with a note that the student should watch the video on absolute numbers. The meaning of multiplication is reviewed, it is repeated addtion. Using a number line they explain how positive and negative numbers impact the equation. 3 x ...1 = 1 + 1 + 1 = 3, -1 x 3 = -1 + -1 + -3. They show it this way to show that a positive times a positive is always a positive and a negative times a positive will always be negative. By the commutative property then a positive times a negative is negative. Then some examples are done. They also show another rule: multiplying a number by -1 is the same as taking the opposite of the number. They then go through a few examples. Then they go through a negative number times a negative number. The rule they discover is: negative times a negative number equals a positive number. Some examples are done. Video is good quality and good for all students as review or initial learning of the concept. There are English captions at the bottom.[more]

This instructor in this video, Sal Khan, discusses how to multiply and divide negative numbers. Mr. Khan uses computer software (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education.

This video offers an explanation of multiplying with negative numbers. This video is suitable for viewing on mobile devices and can be followed with or without audio accompaniment.

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