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AC9M3N05

Number > Estimation

Australian Curriculum Version 9 Says:

Estimate the quantity of objects in collections and make estimates when solving problems to determine the reasonableness of calculations.

What this means

Estimation with numbers.

  • Estimate in this context is not referring to measurement but rather numbers. Strategies might include:
    • Benchmark numbers such as using the number of people in a section of a stadium to determine the size of the crowd.

Tips

  • Encourage students to check the calculations they make when doing AC9M3N03 and AC9M3N04.
  • There are many ways to estimate. Estimating often relies heavily on the context.
  • Stategies include front-end approaches, rounding, clustering and compatible numbers.
  • Apply number sense. For example, when multiplying a single-digit number by a two-digit number the answer will be a two- or three-digit number.

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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.