• Mastery PD Materials

Subtraction as difference

Spine 1: Number, Addition and Subtraction – Topic 1.12

Introduction

Introduce children to subtraction as difference, the third and final subtraction structure; review consecutive numbers, as well as consecutive odd/even numbers, in the context of difference.

Teaching points

  • Teaching point 1: Difference compares the number of objects in one set with the number of objects in another set; or the difference between two measures.
     
  • Teaching point 2: Difference is one of the structures of subtraction.
     
  • Teaching point 3: Consecutive whole numbers have a difference of one; consecutive odd/even numbers have a difference of two.
     
  • Teaching point 4: We can apply the structure of difference to compare data.

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