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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?

Noah

Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Five Coins

Ben has five coins in his pocket. How much money might he have?

I'm Eight

Age 5 to 11
Challenge Level
Try to use as many number operations as you can.
Can you change the starting point of one of your solutions and then tweak it a bit to find another way of making 8?
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
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NRICH is part of the family of activities in the Millennium Mathematics Project.