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

Age

3-6

Materials

  1. Two sets of Small Number Rods.
  2. Plain squared paper and a pencil.
  3. Subtraction Sign Card (optional).


Preparation


Presentation

  1. Directress invites the child to build two stairs with the number rods.
  2. The Directress selects a rod from the right stair, says a 4 rod.
  3. Then she asks the child to select a rod shorter than 4 rod from the left stair.
  4. The child selects 2 rod and places it besides 4 rod.
  5. The Directress invites the child to count together, "1, 2, 3, ... 6.
  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"
  7. Directress then shows the child how to record the statement on plain squared paper, i.e. 6-4=2.
  8. 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