Twenty five years on, our site has grown and changed, and our target audience is now teachers and students working at all levels. And yet we are still working to shake off the commonly held belief that NRICH is just for top set students...
For many years now, our aim has been, wherever possible, to publish "low threshold high ceiling" tasks that whole classes can work on together. With these tasks, everyone can get started, and everyone can get stuck!
Here are some resources which you might find useful:
Secondary Curriculum
Enriching the Secondary Curriculum
What we think and why we think it
Thinking Mathematically
Posters for the classroom.
Teachers can Register for the NRICH email newsletter to be kept up to date with our latest news.
Below are some of our favourite "low threshold high ceiling" tasks for secondary students.
![Poly Plug Rectangles](/sites/default/files/styles/medium/public/thumbnails/content-id-7511-icon.png?itok=jGv2RY6A)
Poly Plug Rectangles
![Dozens](/sites/default/files/styles/medium/public/thumbnails/content-98-03-six2-icon.png?itok=NzwxPabC)
![Reach 100](/sites/default/files/styles/medium/public/thumbnails/content-02-09-penta2-icon.gif?itok=VCjD2daE)
Reach 100
Choose four different digits from 1-9 and put one in each box so that the resulting four two-digit numbers add to a total of 100.
![Tilted Squares](/sites/default/files/styles/medium/public/thumbnails/content-id-2293-icon.png?itok=q-hpU9S_)
Tilted Squares
![Cyclic Quadrilaterals](/sites/default/files/styles/medium/public/thumbnails/content-id-6624-icon.jpg?itok=tQcnV8ND)
Cyclic Quadrilaterals
![Shifting Times Tables](/sites/default/files/styles/medium/public/thumbnails/content-id-6713-icon.png?itok=y_Wtw3Cv)
Shifting Times Tables
![Charlie's delightful machine](/sites/default/files/styles/medium/public/thumbnails/content-id-7024-icon.png?itok=TnFInR1F)
Charlie's delightful machine
![Odds, Evens and More Evens](/sites/default/files/styles/medium/public/thumbnails/content-id-7529-icon.png?itok=9Abf3oXj)
Odds, Evens and More Evens
![Magic Letters](/sites/default/files/styles/medium/public/thumbnails/content-id-7821-icon.png?itok=z67LWboP)
Magic Letters
![Polygon Rings](/sites/default/files/styles/medium/public/thumbnails/content-id-11231-icon.jpg?itok=OSA8CYS6)
![Summing Consecutive Numbers](/sites/default/files/styles/medium/public/thumbnails/content-97-05-six4-icon.png?itok=qriTyABd)
Summing Consecutive Numbers
![Unequal Averages](/sites/default/files/styles/medium/public/thumbnails/content-id-11281-icon.png?itok=L9ubz1Li)
Unequal Averages
![Pair Products](/sites/default/files/styles/medium/public/thumbnails/content-id-2278-icon.png?itok=CPRkwgjz)
Pair Products
![Factorising with Multilink](/sites/default/files/styles/medium/public/thumbnails/content-id-7490-icon.png?itok=JmNdK-Pw)
Factorising with Multilink
![Steel Cables](/sites/default/files/styles/medium/public/thumbnails/content-id-7760-icon.png?itok=iTS5VCIy)
Steel Cables
![Hollow Squares](/sites/default/files/styles/medium/public/thumbnails/content-id-11257-icon.png?itok=aH4Q0l2T)
![Odds and Evens made fair](/sites/default/files/styles/medium/public/thumbnails/content-id-9538-icon.png?itok=H2-05nUP)