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!
Can you find any two-digit numbers that satisfy all of these statements?
Stage: 2 and 3 Challenge Level:
You'll need to know your number properties to win a game of Statement Snap...
Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?
Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?