You may also like

problem icon

Exploring Diagonals

Move the corner of the rectangle. Can you work out what the purple number represents?

problem icon

Drawing Polygons

I wonder which polygons we can draw on dotty paper...

problem icon

Drawing Squares

Take a look at the video showing squares drawn on dotty grids...

Find the Robber

Stage: 3 and 4

This resource is part of "Dotty Grids - Exploring Distance"

Can you help the police locate the robber?

The robber is hiding at a crossroads in a modern city, where the roads are all at right angles and equally spaced.

Choose coordinates where you think the robber might be hiding. The interactivity tells you the shortest distance to the robber, travelling along the roads.

Try to find the robber using only a few guesses.

Download interactivity

 
This text is usually replaced by the Flash movie.


Can you guarantee to always find the robber in less than five guesses? Can you do better than this?

How would your strategy change if the robber were allowed to move 1 block after each guess?

Can you think of any other mathematically interesting variations of the game?

To play a similar game in three dimensions, take a look at Find the Metagiff.

Want to share what you've done? Got any interesting questions or ideas? 
Send us your thoughts.