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Tangrams

Can you make five differently sized squares from the tangram pieces?

Baked Bean Cans

Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?

Three Squares

What is the greatest number of squares you can make by overlapping three squares?

Six to Four

Age 5 to 7 Challenge Level:

How many matchsticks do we need to make one triangle?
How many to make two?
Is there more than one answer to each of these questions?