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# 1.12 Subtraction as difference

Created on 15 January 2018 by ncetm_administrator
Updated on 16 January 2018 by ncetm_administrator

## 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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