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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?
Age 5 to 7 Challenge Level:
Are the following statements about number always true, sometimes true or never true?
How do you know?
What about these statements about shapes?
You could cut out each set of cards from this sheet (word, pdf) and arrange them in this grid.
Can you find examples or counter-examples for each one?
For the “sometimes” cards can you explain when they are true? Or rewrite them so that they are always true or never true?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.