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This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.

The puzzle can be solved with the help of small clue-numbers which are either placed on the border lines between selected pairs of neighbouring squares of the grid or placed after slash marks on. . . .

What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?

A Sudoku with clues given as sums of entries.

Find out about the research activities of the NRICH team and other colleagues here.

A useful entry point into the NRICH site for those students interested in Mathematical Olympiad problems or the Maths Challenges.

As part of Liverpool08 European Capital of Culture there were a huge number of events and displays. One of the art installations was called "Turning the Place Over". Can you find our how it works?

Helpful preparation for university for those intending to study a course involving applied mathematics at university.

These models have appeared around the Centre for Mathematical Sciences. Perhaps you woudl like to try to make some similar models of your own.

Helpful preparation for university for those intending to study engineering.

Helpful preparation for university for those intending to study biological sciences.

News of the NRICH teacm activities from July and August 2009.

This collection of articles, written by teachers, focus on their experiences of embedding NRICH materials into their everyday practice.

This is the curriculum mapping page for statistics modules

This is the curriculum mapping page for mechanics modules

What can you see? What do you notice? What questions can you ask?

Quick, practical ways in which you can help to make your classrooms and lessons maths-rich.

An account of the mathematical problems typically faced by physic students.

Quick FAQs regarding the stemNRICH area of the NRICH website

This is the section of stemNRICH devoted to the advanced applied mathematics underlying the study of the sciences at higher levels

engNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of engineering

physNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of physics

chemNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of chemistry, designed to help develop the mathematics required to get the most from your study. . . .

This is the area of the stemNRICH site devoted to the core applied mathematics underlying the sciences.

Each clue number in this sudoku is the product of the two numbers in adjacent cells.

In this Sudoku, there are three coloured "islands" in the 9x9 grid. Within each "island" EVERY group of nine cells that form a 3x3 square must contain the numbers 1 through 9.