Odd One Out
Age 16 to 18 Short Challenge Level:
In this short problem, can you deduce the likely location of the odd ones out in six sets of random numbers?
Simply Graphs
Age 16 to 18 Challenge Level:
Look for the common features in these graphs. Which graphs belong together?
Polite Numbers
Age 16 to 18 Challenge Level:
A polite number can be written as the sum of two or more consecutive positive integers. Find the consecutive sums giving the polite numbers 544 and 424. What characterizes impolite numbers?
Impossible Triangles?
Age 16 to 18 Challenge Level:
Which of these triangular jigsaws are impossible to finish?
Fix Me or Crush Me
Age 16 to 18 Challenge Level:
Can you make matrices which will fix one lucky vector and crush another to zero?
Pattern Recognition
Age 16 to 18 Challenge Level:
When does a pattern start to exhibit structure? Can you crack the code used by the computer?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.