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Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

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Choose any three by three square of dates on a calendar page...

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Building Tetrahedra

Can you make a tetrahedron whose faces all have the same perimeter?

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Stage: 3 and 4 Challenge Level: Challenge Level:1
Thinking about rectangles and cuboids might be useful.
Try some numbers out for yourself.