Secondary Toughnutslive
Age 11 to 18 Challenge Level:
These secondary problems have not yet been solved. Can you be the first?
Colour Buildinglive
Age 11 to 14 Challenge Level:
Using only the red and white rods, how many different ways are there to make up the other rods?
Different by Onelive
Age 14 to 16 Challenge Level:
Can you make lines of Cuisenaire rods that differ by 1?
Rod Fractionslive
Age 7 to 14 Challenge Level:
Pick two rods of different colours. Given an unlimited supply of rods of each of the two colours, how can we work out what fraction the shorter rod is of the longer one?
Searching for Mean(ing)live
Age 11 to 16 Challenge Level:
If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?
Combining Lengthslive
Age 11 to 16 Challenge Level:
How many different lengths is it possible to measure with a set of three rods?
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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.