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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# This Pied Piper of Hamelin

## You may also like

### Geoboards

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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Age 7 to 11

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

If you had one fewer rat, what could you replace it with to keep the number of legs the same?

How are you keeping track of what you have done?

How are you keeping track of what you have done?

This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.