Difference between revisions of "Bead Bars: Breaking Down the Addends"
From wikisori
(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> | + | *Ten bars |
+ | *Colored bead bar | ||
+ | *Box of signs for operations<br> | ||
=== Preparation === | === Preparation === | ||
− | <br> | + | <br> |
=== Presentation === | === Presentation === | ||
− | <br> | + | #On a strip the directress writes a combination of two or three numbers. |
+ | #The child constructs the problem with bead bars and symbols and computes the answer and puts out the corresponding bead bars for the sum. | ||
+ | #The child reads the equation. | ||
+ | #The directress lays out combinations in parentheses that equal each addend of the first problem, i.e. 1st 9+7+8= 24, 2nd (4+5) + (3+4) + (6+2) = | ||
+ | #The child computes this as before, adding the first two addends in parentheses, placing the bead bar for the sum below, etc. | ||
+ | #Those three are added again to obtain the same answer as before. | ||
+ | #It is noticed that the first and third equations are identical. | ||
+ | #In the second, each addend was broken down into two smaller addends.<br><br> | ||
=== Control Of Error === | === Control Of Error === | ||
− | <br> | + | <br> |
=== Points Of Interest === | === Points Of Interest === | ||
− | <br> | + | <br> |
=== Purpose === | === Purpose === | ||
− | <br> | + | *To give the concept of the dissociative property of addition.<br> |
=== Variation === | === Variation === | ||
− | <br> | + | <br> |
=== Links === | === Links === | ||
− | <br> | + | <br> |
=== Handouts/Attachments === | === Handouts/Attachments === | ||
− | <br> | + | <br> |
[[Category:Mathematics]] | [[Category:Mathematics]] |
Revision as of 05:18, 25 June 2009
Contents
Age
6-9.
Materials
- Ten bars
- Colored bead bar
- Box of signs for operations
Preparation
Presentation
- On a strip the directress writes a combination of two or three numbers.
- The child constructs the problem with bead bars and symbols and computes the answer and puts out the corresponding bead bars for the sum.
- The child reads the equation.
- The directress lays out combinations in parentheses that equal each addend of the first problem, i.e. 1st 9+7+8= 24, 2nd (4+5) + (3+4) + (6+2) =
- The child computes this as before, adding the first two addends in parentheses, placing the bead bar for the sum below, etc.
- Those three are added again to obtain the same answer as before.
- It is noticed that the first and third equations are identical.
- In the second, each addend was broken down into two smaller addends.
Control Of Error
Points Of Interest
Purpose
- To give the concept of the dissociative property of addition.
Variation
Links
Handouts/Attachments