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Topics: Starter  Arithmetic  Investigations  Puzzles
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Can you prove that the centre number has to be odd?
You may want to print out this page, cut out each answer and arrange them into groups. This may help you spot patterns.
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Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a multilevel version of this activity.