Wednesday, March 20, 2013

March 20th and 21st - Investigation 3.1 and 3.2

Investigation 3.1 - Introducing Multiplication of Integers

The goals of today's lesson:

  • Use a number line and motion model to develop the relationship between repeated addition and multiplication with integers
  • Develop and use algorithms for multiplying integers.
Some of the algorithms uncovered by our students were:
  • When two factors have the same sign then the product is positive.
  • When two factors have opposite signs the product is a negative number.
Investigation 3.2 
Here is a video showing a different method of understanding the multiplication of integers using a pattern method.

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