Difference between revisions of "Colored Bead Bars: Inverse Products"
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(New page: === Age === <br> === Materials === <br> === Preparation === <br> === Presentation === <br> === Control Of Error === <br> === Points Of Interest === <br> === Purpose...) |
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| Line 1: | Line 1: | ||
=== Age === | === Age === | ||
| − | <br> | + | 6-9.<br> |
=== Materials === | === Materials === | ||
| − | <br> | + | *Bbox of colored bead bars 1-10 |
| + | *Chart I<br> | ||
=== Preparation === | === Preparation === | ||
| − | <br> | + | <br> |
=== Presentation === | === Presentation === | ||
| − | <br> | + | #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.<br> | ||
=== Control Of Error === | === Control Of Error === | ||
| − | <br> | + | <br> |
=== Points Of Interest === | === Points Of Interest === | ||
| − | <br> | + | <br> |
=== Purpose === | === Purpose === | ||
| − | <br> | + | *To help the child on the memorization of multiplication understanding of the commutative property of multiplication.<br> |
=== Variation === | === Variation === | ||
| − | <br> | + | <br> |
=== Links === | === Links === | ||
| − | <br> | + | <br> |
=== Handouts/Attachments === | === Handouts/Attachments === | ||
| − | <br> | + | <br> |
| − | [[Category:Mathematics]] | + | [[Category:Mathematics]][[Category:Mathematics_6-9]] |
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
