Core Maths - Discrete Maths

Substitution Cipher

Age 11 to 14
Challenge Level

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Flow Chart

Age 11 to 14
Challenge Level

The flow chart requires two numbers, M and N. Select several values for M and try to establish what the flow chart does.

Zeller's Birthday

Age 14 to 16
Challenge Level

What day of the week were you born on? Do you know? Here's a way to find out.

Sorted

Age 14 to 18
Challenge Level

How can you quickly sort a suit of cards in order from Ace to King?