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Three by Three
Age 5 to 11
Challenge Level 
Arrange three red, three blue and three yellow counters into a three-by-three square grid, so that there is only one of each colour in every row and every column.
Can you arrange four different colour counters into a four-by-four square grid, so that there is only one of each colour in every row and every column?
How about five colours in a five-by-five grid? Six...?
Printable NRICH Roadshow resource.
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Geoboards
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
