Problems
Consecutive Seven
Age 11 to 14 Challenge Level:
Can you arrange these numbers into 7 subsets, each of three numbers, so that when the numbers in each are added together, they make seven consecutive numbers?
Stars
Age 11 to 14 Challenge Level:
Can you find a relationship between the number of dots on the circle and the number of steps that will ensure that all points are hit?
Arithmagons
Age 14 to 16 Challenge Level:
Can you find the values at the vertices when you know the values on the edges?
Spot the Card
Age 14 to 16 Challenge Level:
It is possible to identify a particular card out of a pack of 15 with the use of some mathematical reasoning. What is this reasoning and can it be applied to other numbers of cards?
Sheffuls
Age 14 to 16 Challenge Level:
Discover a handy way to describe reorderings and solve our anagram in the process.
Featured Solution
Isosceles Triangles
Yanqing from Devonport High School for Girls sent us a very clear explanation of her solution to this problem.
Articles & Games
Shuffles Tutorials
Learn how to use the Shuffles interactivity by running through these tutorial demonstrations.
Part the Piles
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
NRICH is part of the family of activities in the Millennium Mathematics Project.