Difference between revisions of "Substraction with Small Number Rods"
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=== Age === | === Age === | ||
| − | 3-6 <br> | + | 3-6 <br> |
=== Materials === | === Materials === | ||
| − | #Two sets of Small Number Rods. | + | #Two sets of Small Number Rods. |
| − | #Plain squared paper and a pencil. | + | #Plain squared paper and a pencil. |
#Subtraction Sign Card (optional). | #Subtraction Sign Card (optional). | ||
| − | <br> | + | <br> |
=== Preparation === | === Preparation === | ||
| − | <br> | + | <br> |
=== Presentation === | === Presentation === | ||
| − | #Directress invites the child to build two stairs with the number rods. | + | #Directress invites the child to build two stairs with the number rods. |
| − | #The Directress selects a rod from the right stair, says a 4 rod. Then she asks the child to select a rod shorter than 4 rod from the left stair. The child selects 2 rod and places it besides 4 rod. | + | #The Directress selects a rod from the right stair, says a 4 rod. |
| − | #The Directress invites the child to count together, "1, 2, 3, ... 6. Four and two makes 6. Let's take away 2 (Directress removes 2 rod). How many left? 1, 2, 3, 4. (count). 6 takes away 2 equals 4" | + | #Then she asks the child to select a rod shorter than 4 rod from the left stair. |
| − | #Directress then shows the child how to record the statement on plain squared paper, i.e. 6-4=2. | + | #The child selects 2 rod and places it besides 4 rod. |
| + | #The Directress invites the child to count together, "1, 2, 3, ... 6. | ||
| + | #Four and two makes 6. Let's take away 2 (Directress removes 2 rod). How many left? 1, 2, 3, 4. (count). 6 takes away 2 equals 4" | ||
| + | #Directress then shows the child how to record the statement on plain squared paper, i.e. 6-4=2. | ||
#Directress may go on with the presentation by showing a few more examples. | #Directress may go on with the presentation by showing a few more examples. | ||
| − | <br> | + | <br> |
=== Control Of Error === | === Control Of Error === | ||
| − | The rods themselves act as Control of Error because the quantities are fixed. <br> | + | The rods themselves act as Control of Error because the quantities are fixed. <br> |
=== Points Of Interest === | === Points Of Interest === | ||
| − | <br> | + | <br> |
=== Purpose === | === Purpose === | ||
| − | *Introduce the child to Subtraction situations with answer (differences) under 10. | + | *Introduce the child to Subtraction situations with answer (differences) under 10. |
*Show the child how to record subtraction questions with answers under 10. | *Show the child how to record subtraction questions with answers under 10. | ||
| − | <br> | + | <br> |
=== Variation === | === Variation === | ||
| − | You may use only 1 set of Rods. For example: 6-4=2.<br>Select 6 rod. Count from the right end 1, 2, 3, 4 and cover those with your fingers. The answer is those left uncovered, which are 2. <br> | + | You may use only 1 set of Rods. For example: 6-4=2.<br>Select 6 rod. Count from the right end 1, 2, 3, 4 and cover those with your fingers. The answer is those left uncovered, which are 2. <br> |
=== Handouts/Attachment === | === Handouts/Attachment === | ||
| − | <br> | + | <br> |
| − | [[Category:Mathematics]][[Category:Mathematics_3-6]] | + | [[Category:Mathematics]] [[Category:Mathematics_3-6]] |
Latest revision as of 04:49, 15 October 2009
Contents
Age
3-6
Materials
- Two sets of Small Number Rods.
- Plain squared paper and a pencil.
- Subtraction Sign Card (optional).
Preparation
Presentation
- Directress invites the child to build two stairs with the number rods.
- The Directress selects a rod from the right stair, says a 4 rod.
- Then she asks the child to select a rod shorter than 4 rod from the left stair.
- The child selects 2 rod and places it besides 4 rod.
- The Directress invites the child to count together, "1, 2, 3, ... 6.
- Four and two makes 6. Let's take away 2 (Directress removes 2 rod). How many left? 1, 2, 3, 4. (count). 6 takes away 2 equals 4"
- Directress then shows the child how to record the statement on plain squared paper, i.e. 6-4=2.
- Directress may go on with the presentation by showing a few more examples.
Control Of Error
The rods themselves act as Control of Error because the quantities are fixed.
Points Of Interest
Purpose
- Introduce the child to Subtraction situations with answer (differences) under 10.
- Show the child how to record subtraction questions with answers under 10.
Variation
You may use only 1 set of Rods. For example: 6-4=2.
Select 6 rod. Count from the right end 1, 2, 3, 4 and cover those with your fingers. The answer is those left uncovered, which are 2.
Handouts/Attachment
