
This group tasks allows you to search for arithmetic progressions in the prime numbers. How many of the challenges will you discover for yourself?

This problem is a sequence of linked mini-challenges leading up to the proof of a difficult final challenge, encouraging you to think mathematically. Starting with one of the mini-challenges, how. . . .

Explore the properties of matrix transformations with these 10 stimulating questions.
We really liked the way Alex approached the solution to this problem, using a mixture of numerical and pure methods.
Members of the NRICH team are beginning to write blogs and this very short article is designed to put the reasoning behind this move in context.
NRICH website full of rich tasks and guidance. We want teachers to use what we have to offer having a real sense of what we mean by rich tasks and what that might imply about classroom practice.