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Are You Sure?
In this feature you are invited to explore a variety of problems, and are then asked to construct convincing arguments to explain what you have discovered. You will also be introduced to the symbols $\implies$ and $\iff$ and be challenged to use these to create true statements.
The last day for sending in your solutions to the live problems is Monday 16 May.
Maxi Pyramid
Age 11 to 16
Challenge Level 
What is the largest number you can obtain at the top of this pyramid?
River Crossing
Age 11 to 18
Challenge Level
There is nothing half so much worth doing as simply messing about in boats...
Isosceles Seven
Age 14 to 16
Challenge Level
Is it possible to find the angles in this rather special isosceles triangle?
The Tour De Clochemerle
Age 14 to 18
Challenge Level
Can you work out where these 5 riders came in a not-quite-so-famous bike race?
Iffy Logic
Age 14 to 18
Challenge Level
Can you rearrange the cards to make a series of correct mathematical statements?
Iff
Age 14 to 18
Challenge Level
Take a triangular number, multiply it by 8 and add 1. What is special about your answer? Can you prove it?
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