Substraction with Small Number Rods

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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