Multiplying & Dividing Positive & Negative Numbers

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
6581 views | 2 ratings
Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson, you will learn how to multiply and divide positive and negative numbers. The rules for determining whether the answer is positive or negative are explained and demonstrated using several examples. The lesson also includes a physical model using counters to help explain why negative times negative produces a positive result, as well as a pattern-based justification for the same concept. By the end of the lesson, you will have a solid understanding of multiplying and dividing with positive and negative numbers.

Lesson Description:

Shows the rules for multiplying and dividing negative and positive numbers. Shows why negative times negative produces a negative number using counters.

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Questions answered by this video:
  • How do you multiply and divide integers?
  • When you are multiplying and dividing positive and negative numbers, how do you know when the answer is positive or negative?
  • What happens if a positive or negative number is multiplied by 0?
  • What happens if 0 is divided by a positive or negative number?
  • What happens if you divide a number by 0?
  • What are the rules for determining whether the result will be positive or negative when multiplying and dividing numbers?
  • Where can I find a bunch of example problems for deciding whether the answer to a multiplication or division problem is positive or negative?
  • How do you know if -1*-2*-3*-1*-5 will be positive or negative?
  • How can you figure out what (-8*4)-2 equals?
  • Why does a negative times a positive make a negative?
  • Why do two negative numbers multiply to make a positive?
  • Why does -3 * -2 equal positive 6?
  • Staff Review

    • Currently 4.0/5 Stars.
    A whole bunch of problems of multiplying and dividing integers are explained in this problem. First, we figure out whether the answer will be positive or negative, and then we find the answer. Some problems have multiple numbers multiplied together. This lesson also explains why multiplying positive and negative numbers ends up the way it does.
  • squeaky78

    • Currently 4.0/5 Stars.
    dividing integers is a lot of steps!!!!!!