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problem
Favourite
Ring a ring of numbers
5 to 7
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
problem
Favourite
Always, sometimes or never?
5 to 11
Are these statements relating to odd and even numbers always true, sometimes true or never true?
article
Developing a framework for mathematical enrichment
This paper considers the key aspects of mathematics enrichment and
how the content and design of trails (as well as the NRICH site
itself) has been influenced by, and built upon, these philosophies.
article
A problem is a problem for all that
In this article, Jennifer Piggott talks about just a few of the problems with problems that make them such a rich source of mathematics and approaches to learning mathematics.
article
Divided differences
When in 1821 Charles Babbage invented the `Difference Engine' it was intended to take over the work of making mathematical tables by the techniques described in this article.
problem
Favourite
Break it up!
5 to 11
In how many different ways can you break up a stick of seven interlocking cubes? Now try with a stick of eight cubes and a stick of six cubes. What do you notice?
problem
Favourite
Going to the cinema
A cinema has 100 seats. Is it possible to fill every seat and take exactly £100?
article
Choosing rich tasks for secondary classes
In this article, read about the thinking behind the September 2010 secondary problems and why we hope they will be an excellent selection for a new academic year.
article
Primary proof?
Proof does have a place in Primary mathematics classrooms, we just need to be clear about what we mean by proof at this level.