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problem
A Bit of a Dicey Problem
7 to 11
When you throw two regular, six-faced dice you have more chance of getting one particular result than any other. What result would that be? Why is this?
problem
Favourite
Cosy Corner
11 to 14
Six balls are shaken. You win if at least one red ball ends in a corner. What is the probability of winning?
problem
Favourite
A Cartesian Puzzle
7 to 11
Find the missing coordinates which will form these eight quadrilaterals. These coordinates themselves will then form a shape with rotational and line symmetry.
problem
Which Numbers? (2)
7 to 11
I am thinking of three sets of numbers less than 101. Can you find all the numbers in each set from these clues?
problem
Which Numbers? (1)
7 to 11
I am thinking of three sets of numbers less than 101. They are the
red set, the green set and the blue set. Can you find all the
numbers in the sets from these clues?
article
Devon Teachers Enriching NRICH - Part 2
This is the second part of an article describing the Enriching Mathematics project in Devon in 2008-9. The participating teachers describe NRICH activities they have tried with their learners.
problem
Favourite
Reaction Timer
11 to 14
This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.
article
Opening Out
Bernard Bagnall describes how to get more out of some favourite NRICH investigations.
article
Con Tricks
Here are some examples of 'cons', and see if you can figure out where the trick is.