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problem
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Sieve of Eratosthenes
11 to 14
Follow this recipe for sieving numbers and see what interesting patterns emerge.
problem
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Constructing Triangles
11 to 14
Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?
problem
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Always, sometimes or never? Shape
7 to 11
Are these statements always true, sometimes true or never true?
problem
Linked Chains
7 to 11
Can you find ways to make twenty-link chains from these smaller chains? This gives opportunities for different approaches.
problem
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Doing and Undoing
5 to 11
An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.
problem
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Build It Up
7 to 11
Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.
article
On Problems and Problem Solving - Looking Backward and Forward
Jenny Piggott reflects on the event held to mark her retirement
from the directorship of NRICH, but also on problem solving itself.
article
What Does It Mean to "use the Interactive Whiteboard" in the Daily Numeracy Lesson?
There have been a number of reports on the effectiveness of the use of the interactive whiteboard to motivate teachers and pupils and to give pace to lessons. However, there is little evidence to suggest that we all have the same image of how the whiteboard is being used in the context that gives rise to the evaluation. This article attempts to make explicit possible meanings of the phrase "using an interactive whiteboard" and to encourage further debate.
article
Interacting with the Geometry of the Circle
Jennifer Piggott and Charlie Gilderdale describe a free interactive
circular geoboard environment that can lead learners to pose
mathematical questions.