Cracking Codes
When a secret agent wants to send a message, they write it in code so their enemies can't read it. Codebreakers need to develop mathematical skills like working backwards, being systematic, and ruling out possibilities in order to crack enemy codes and save the day. These problems will give you the chance to train your brain in order to become a better code cracker!
Satisfying Statements Age 11 to 14
Challenge Level
Challenge Level
Can you find any two-digit numbers that satisfy all of these statements?
Statement Snap Age 7 to 14
Challenge Level
Challenge Level
You'll need to know your number properties to win a game of Statement Snap...
Charlie's Delightful Machine Age 11 to 16
Challenge Level
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 Thinking Age 14 to 16
Challenge Level
Challenge Level
Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?
Copyright © 1997 - 2023. University of Cambridge.
All rights reserved.
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.