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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?

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

Five Coins

Age 5 to 11
Challenge Level

Ben has five coins in his pocket.

How much money might he have? If possible, talk to someone else about your ideas.

What is the smallest amount of money he could have? How do you know?

What is the largest amount of money he could have? How do you know?

What if he still had five coins, but only 1ps and/or 2ps? How much might he have now?
Can you find all the possibilities?
How do you know you have found them all?

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.