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Square Corners
Age 7 to 11
Challenge Level 
One way to start would be to find all the possible places for the four counters to go that would actually make a square.
Or you could fill in the grid with counters one by one, checking to make sure you haven't made a square.
Being systematic (i.e. doing things in a logical order) is the key!
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Geoboards
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
