Stage: 1 Challenge Level: 
You could try putting one piece in to start with and then seeing
whether you can place another piece next to it.
Are you sure that triangle is the only possibility?
Are you sure that triangle is the only possibility?
Interactivities. Combinations. Games. Addition & subtraction. Multiplication & division. Practical Activity. Representing. Working systematically. Trial and improvement. Visualising.
Published April 2001,March 2009,April 2009.
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