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AC9M3N03

Number > Addition & Subtraction

Australian Curriculum Version 9 Says:

Add and subtract two- and three-digit numbers using place value to partition, rearrange and regroup numbers to assist in calculations without a calculator.

What this means

Adding and subtracting, two numbers up to three digits each.

  • Partition (by place value); split numbers according to standard place value (e.g. 435 as 400 + 30 + 5) or non-standard place value (e.g. 420 + 15) to help calculate. (See the card for 2N02 for more information.)
  • Regroup; when adding 8 tens and 5 tens the result is 13 tens or regrouped or recorded as 1 hundred and 3 tens.

Tip

  • Students need to see various ways of adding and subtracting, including standard written algorithms. They require flexible thinking about place value.

Click on image to Enlarge descriptor card.

Download Full Guide

Interactives & Downloadables

Arrow Cards Virtual Manipulative

Virtual Manipulative visualiser for Place Value Arrow Cards ...
0.00 KB 427

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.