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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Codes and Inverses

### Satisfying Statements

### Statement Snap

### Charlie's Delightful Machine

### A Little Light Thinking

### Which Spinners?

### Data Matching

Links to the University of Cambridge website
Links to the NRICH website Home page

Nurturing young mathematicians: teacher webinars

30 April (Primary), 1 May (Secondary)

30 April (Primary), 1 May (Secondary)

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In this feature, we have chosen a selection of problems related to the theme of Codes and Codebreaking. The article Codebreakers has suggestions about how you can inspire your students through the exciting context of codes and spies to be curious about a wide range of mathematical ideas.

This article for Primary and Secondary teachers is all about the mathematics behind solving puzzles, unravelling mysteries and breaking codes.

Age 11 to 14

Challenge Level

Can you find any two-digit numbers that satisfy all of these statements?

Age 7 to 14

Challenge Level

You'll need to know your number properties to win a game of Statement Snap...

Age 11 to 16

Challenge Level

Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?

Age 14 to 16

Challenge Level

Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?

Age 14 to 18

Challenge Level

Can you work out which spinners were used to generate the frequency charts?

Age 14 to 18

Challenge Level

Use your skill and judgement to match the sets of random data.