How many winning lines can you make in a three-dimensional version of noughts and crosses?
How many solutions can you find to this sum? Each of the different letters stands for a different number.
This article -useful for teachers and learners - gives a short account of the history of negative numbers.
This article shows how abstract thinking and a little number theory throw light on the scoring in the game Go.
This article looks at how models support mathematical thinking about numbers and the number system
This article for the young and old talks about the origins of our number system and the important role zero has to play in it.
In this article for teachers, Bernard gives an example of taking an initial activity and getting questions going that lead to other explorations.
Vicki Pike was one of four NRICH Teacher Fellows who worked on embedding NRICH materials into their teaching. In this article, she writes about her experiences of working with students at Key Stage two.
These two group activities use mathematical reasoning - one is numerical, one geometric.
