Take it in turns to make a triangle on the pegboard. Can you block your opponent?
Stage: 1 Challenge Level:
You could try with a three by three dotty grid first to get the
idea of the problem.
You might want to work with a partner so you have someone to check
that your triangles are all different.
Have you got all the triangles which have a corner at the corner of
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. More information on many of our other activities
can be found here.