What could the half time scores have been in these Olympic hockey matches?
Find the missing coordinates which will form these eight quadrilaterals. These coordinates themselves will then form a shape with rotational and line symmetry.
Six balls are shaken. You win if at least one red ball ends in a corner. What is the probability of winning?
Bernard Bagnall describes how to get more out of some favourite NRICH investigations.
I am thinking of three sets of numbers less than 101. Can you find all the numbers in each set from these clues?
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.
Here are some examples of 'cons', and see if you can figure out where the trick is.
This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.
