Difference between revisions of "Colored Bead Bars: Inverse Products"
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Latest revision as of 04:14, 20 July 2009
Contents
Age
6-9.
Materials
- Bbox of colored bead bars 1-10
- Chart I
Preparation
Presentation
- The directress asks the child to take the bar of 7, 6 times.
- The bars are lain in a column.
- Directress says: "How do we express this?"
- 7 x 6 = 42 is written down.
- Now , directress takes the bar of 6, 7 times.
- These are lain next to the others.
- When the child writes down 6 x 7 =42, he should observe that the product was the same.
- Directress says: "Are the multiplication problems the same? Notice that the two rectangles are equal, each having 42. even though the order of the factors is not the same".
- The child should observe in the written form that the factors are the same, just reversed in their positions.
- Directress gives several examples of this.
Control Of Error
Points Of Interest
Purpose
- To help the child on the memorization of multiplication understanding of the commutative property of multiplication.
Variation
Links
Handouts/Attachments
