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How many faces can you see when you arrange these three cubes in different ways?

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I'm Eight

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Let's Investigate Triangles

Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?

Always, Sometimes or Never?

Age 5 to 11 Challenge Level:
Can you think of an example when it isn’t true?
How do you know that it is always true?
Is it possible to check all examples? Is there another way of knowing?