Satisfying Statementslive
Stage: 2 and 3 Challenge Level: 
Can you find any two-digit numbers that satisfy all of these statements?
Charlie's Delightful Machinelive
Stage: 3 and 4 Challenge Level:
Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?
A Little Light Thinkinglive
Stage: 4 Challenge Level:
Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?
Which Spinners?live
Stage: 4 and 5 Challenge Level:
Can you work out which spinners were used to generate the frequency charts?
Data Matchinglive
Stage: 5 Challenge Level:
Use your skill and judgement to match the sets of random data.
Stage 3 and 4 Toughnutslive
Stage: 3 Challenge Level:
These Stage 3 and 4 problems have not yet been solved. Can you be the first?
Stage 4 & 5 Toughnutslive
Stage: 5 Challenge Level:
These Stage 4 and 5 problems haven't been solved yet. Can you be the first?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.