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
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?
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
2 out of 3
Favourite
Reach 100
7 to 11
2 out of 3
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.
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
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.
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?