This practical problem challenges you to create shapes and patterns
with two different types of triangle. You could even try
What do these two triangles have in common? How are they related?
In how many ways can you fit two of these yellow triangles
together? Can you predict the number of ways two blue triangles can
be fitted together?
This problem invites you to build 3D shapes using two different
triangles. Can you make the shapes from the pictures?
Can you describe what happens in this film?
You have been given nine weights, one of which is slightly heavier
than the rest. Can you work out which weight is heavier in just two
weighings of the balance?
Here is a solitaire type environment for you to experiment with. Which targets can you reach?
Esther worked out general formulae for this problem.
Go to last month's problems to see more solutions.
A game in which players take it in turns to choose a number. Can you block your opponent?