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News & Blog

September 19, 2002  |  By Northwest Montessori In Mathematics

Addition strip board (Presentation 4, Commutative law) 

addition4

Recommended Age: 5 years and onwards (can be younger depending on the child’s skills and experiences) 

 

Purpose: To present the entire structure of addition and to help the child memorise the addition combinations 

 

Level of Parent Involvement: Medium, the adult must present this exercise to the child, once the child has been shown they may work independently 

 

Prerequisites 

  • The child must be able to count accurately from 1-10 and onwards 
  • The child must be able to write numbers 
  • The child must be able to match the numeral symbol with its quantity of numbers 1-10 and beyond 
  • The child must have had many experiences doing addition with the golden beads 
  • The child has been presented to the first, second and third presentations of the addition strip board (see activity library) 

 

Materials 

* The addition strip board 

* Blue strips 1 to 9 

* Red strips with partitions 1 to 9 

* Pencil 

* Small pieces of blank paper 

* Ruler 

* Control chart 2 

NOTE; if doing this exercise with your child from home you will be using the paper version from your resource pack 

 

Preparation 

  • None 

Steps 

  •  Invite the child together bringing the materials to the table 
  • Invite the child to choose their favourite number (for example 12) and write it on the paper 
  • Then invite the child to make that number as many ways as they can as per presentation 3 (using the example of 12 again) 
  • Once the child has made the number as many ways as they can, the child writes down all equations 
  • Then say to the child “how many ways did you make 12? lets read them” 
  • Together with the child read the equations, drawing the child’s attention to sums that are the same (9+3 and 3+9) by saying “I heard you read that before”, move the strips for that equation down to the bottom of the board (see image below) 
  • Show the child how to use the ruler to rule a line across the sum, repeat for other equations that are the same 
  • Then say to the child “now how many ways do you have?” 
  • Introduce control chart 2 and invite child to check equations 
  • Invite the child to choose another number to work independently with “how many ways”, the child may cross out
     

Variations 

  • None 

 

 

Article by Northwest Montessori

Previous StoryHow many ways can you make a number? (Addition strip board Presentation 3)
Next StoryAddition chart 4 

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