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Reasoning

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Billiard balls.
Source: James Barker/Freedigitalphotos.net

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Row of squares task.

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A learning story about addition reasoning.

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Proof by modelling.

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Mungo Man poster.
Source: © 2012 MathsIsFun.com

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Similar or not?

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One example of paper folding.

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Screen grab from L7803 Finding symmetry: one line: city.
© Education Services Australia, 2011