AC9M4A01

Algebra > Addition and Subtraction

Australian Curriculum Version 9 Says:

Find unknown values in numerical equations involving addition and subtraction, using the properties of numbers and operations.

What this means

Working out unknown values in calculations like 27 + ? = 63 or ? = 63 – 27

  • To help work out the unknown value students can use diagrams such as part-part whole or bar diagrams. This will assist in understanding the commutative property of addition (rearranging parts) and inverse operation – linking addition and subtraction.
  • Students may draw on properties of number such as the commutative property of addition (7 + 2 = 2 + 7), that is, rearrange the parts (see part-part whole diagram).
  • Year 4 is the final year that focuses purely on addition and subtraction of whole numbers. In Year 5 addition and subtraction are applied to solving word problems. In Year 6 students add and subtract decimals. Whole number addition and subtraction will need to be consolidated in this year.

Tip

  • Year 4 involves addition and subtraction. Year 5 involves multiplication and division.

Click on image to Enlarge descriptor card.

Resources & Manipulatives

These Quick Curriculum Guides have been designed to take a look at the Australian Mathematics Curriculum (AC9), explain terminology and provide interpretations.

Narelle and I have used our professional judgement to put forward what is appropriate for students at this year level.

Authors: Dr Paul Swan & Narelle Rice
We would like to also thank Linda Marshall and David Dunstan for comments and assistance.

These documents serve as general advice only and do not take into account your specific needs and conditions. While best care has been taken in compiling these materials, mistakes may exist.
Australian Curriculum version 9 materials used under Creative Commons licence from ACARA. Readers should always refer back to the curriculum itself and the state-based curriculum that is relevant for you.

This document is copyright of A-Z Type (Dr Paul Swan). A copy of this document may be downloaded from www.drpaulswan.com.au.