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Latin Squares
A Latin square of order n is an array of n symbols in which each symbol occurs exactly once in each row and exactly once in each column.
Working systematically
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articleAn Introduction to Magic Squares
Find out about Magic Squares in this article written for students. Why are they magic?! -
articleMaths Trails
The NRICH team are always looking for new ways to engage teachers and pupils in problem solving. Here we explain the thinking behind maths trails. -
pageMaking Maths: Double-Sided Magic Square
Make your own double-sided magic square. But can you complete both sides once you've made the pieces?
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pageProblem Solving, Using and Applying and Functional Mathematics
Problem solving is at the heart of the NRICH site. All the problems give learners opportunities to learn, develop or use mathematical concepts and skills. Read here for more information. -
pageIntegrated Sums Sudoku
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 the intersections between two diagonally adjacent squares.
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Binomial Coefficients
An introduction to the binomial coefficient, and exploration of some of the formulae it satisfies.
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articleEncouraging Primary Children to Work Systematically
This article for primary teachers suggests ways in which to help children become better at working systematically. -
articlePeg and Pin Boards
This article for teachers suggests activities based on pegboards, from pattern generation to finding all possible triangles, for example.
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problemApproaching Midnight: First or Second?
Jennie tried the Approaching Midnight game and wondered if it matters whether you go first or second.