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6.1 Learning about Multiplication Using Dynamic Sketches of an Area Model - 29 views

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multiplication decimals

shared by mwellis on 31 Aug 12 - No Cached
  • The figure below shows a rectangle with width 3 and height y. The product 3y represents the area of the 3-by-y rectangle. Change the value of y by dragging the red point up and down the vertical axis. Note that as the point is dragged, the area of the rectangle changes simultaneously.
    • mwellis
      mwellis on 31 Aug 12
       
      This is a great exploration for students to begin making connections between whole number multiplication and decimal multiplication.  One modification I would make is to have students make a partition (on grid paper) to show the partial products so I could connect the figure to a symbolic algorithm for multiplication and the distributive property.  For example, if it was 1.2 x 3, the partial products might be (1x3) + (.2 x 3).
  • mwellis on 31 Aug 12
     
    Example of using area model to explore multiplication by values greater than 1 and values between 0 and 1.
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