In a Box
Age 14 to 16
Challenge Level
Chris and Jo put two red and four blue ribbons in a box. They each pick a ribbon from the box without looking. Jo wins if the two ribbons are the same colour. Is the game fair?
Two's Company
Age 11 to 14
Challenge Level
Seven balls are shaken. You win if the two blue balls end up touching. What is the probability of winning?
Cosy Corner
Age 11 to 14
Challenge Level
Six balls are shaken. You win if at least one red ball ends in a corner. What is the probability of winning?
Substitution Cipher
Age 11 to 14
Challenge Level
Find the frequency distribution for ordinary English, and use it to help you crack the code.
Which Spinners?
Age 14 to 18
Challenge Level
Can you work out which spinners were used to generate the frequency charts?
M, M and M
Age 11 to 14
Challenge Level
If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?
Sociable Cards
Age 11 to 14
Challenge Level
Move your counters through this snake of cards and see how far you can go. Are you surprised by where you end up?
Last One Standing
Age 14 to 16
Challenge Level
Imagine a room full of people who keep flipping coins until they get a tail. Will anyone get six heads in a row?
What Does Random Look Like?
Age 11 to 14
Challenge Level
Engage in a little mathematical detective work to see if you can spot the fakes.
Perception Versus Reality
Age 14 to 18
Challenge Level
Infographics are a powerful way of communicating statistical information. Can you come up with your own?
Wipeout
Age 11 to 16
Challenge Level
Can you do a little mathematical detective work to figure out which number has been wiped out?
Box Plot Match
Age 14 to 16
Challenge Level
Match the cumulative frequency curves with their corresponding box plots.
Unequal Averages
Age 11 to 14
Challenge Level
Play around with sets of five numbers and see what you can discover about different types of average...
NRICH is part of the family of activities in the Millennium Mathematics Project.