Prime numbers

There are 49 NRICH Mathematical resources connected to Prime numbers
A Biggy
problem

A Biggy

Age
14 to 16
Challenge level
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Find the smallest positive integer N such that N/2 is a perfect cube, N/3 is a perfect fifth power and N/5 is a perfect seventh power.
Em'power'ed
problem

Em'power'ed

Age
16 to 18
Challenge level
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Find the smallest numbers a, b, and c such that: a^2 = 2b^3 = 3c^5 What can you say about other solutions to this problem?
Some Cubes
problem

Some Cubes

Age
16 to 18
Challenge level
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The sum of the cubes of two numbers is 7163. What are these numbers?
What's Left?
problem

What's Left?

Age
5 to 7
Challenge level
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Use this grid to shade the numbers in the way described. Which numbers do you have left? Do you know what they are called?
Round and round the circle
problem

Round and round the circle

Age
7 to 11
Challenge level
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What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.
Prompt Cards
problem

Prompt Cards

Age
7 to 11
Challenge level
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These two group activities use mathematical reasoning - one is numerical, one geometric.
Swimming Pool Tiles
problem

Swimming Pool Tiles

Age
7 to 11
Challenge level
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This activity creates an opportunity to explore all kinds of number-related patterns.
Statement Snap
problem

Statement Snap

Age
7 to 14
Challenge level
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You'll need to know your number properties to win a game of Statement Snap...