article
The Surveyor Who Came to Tea
This article discusses how a survey company carries out its surveys and some of the issues involved.
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article
Keeping It Safe and Quiet
Simon Singh describes PKC, its origins, and why the science of code making and breaking is such a secret occupation.
problem
2 out of 3
Junior Frogs
5 to 11
2 out of 3
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
article
Developing Number Fluency - What, Why and How
In this article for primary teachers, Lynne McClure outlines what is meant by fluency in the context of number and explains how a selection of NRICH tasks can help.
problem
1 out of 3
Favourite
Seeing Squares
5 to 11
1 out of 3
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
problem
1 out of 3
Favourite
Seeing Parallelograms
7 to 11
1 out of 3
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.
problem
1 out of 3
Favourite
Play to 37
7 to 11
1 out of 3
In this game the winner is the first to make the total 37. Is this a fair game?
problem
1 out of 3
Favourite
Fruity Totals
7 to 16
1 out of 3
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
article
May the Best Person Win
How can people be divided into groups fairly for events in the Paralympics, for school sports days, or for subject sets?
problem
1 out of 3
Spectrometry Detective
16 to 18
1 out of 3
From the atomic masses recorded in a mass spectrometry analysis can
you deduce the possible form of these compounds?