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You are pretending to hold this in front of you.
Try to describe to someone how it will now look to you.
Now try this one:
If you feel you could go further try this one:
And my last suggestion as a different way of flipping is:
How did you get on?
Can you tell where the triangle will be?
Make a cube out of straws and have a go at this practical challenge.
Reasoning about the number of matches needed to build squares that share their sides.
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?