You may also like

Teddy Town

There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?

4 Dom

Use these four dominoes to make a square that has the same number of dots on each side.

Just Rolling Round

P is a point on the circumference of a circle radius r which rolls, without slipping, inside a circle of radius 2r. What is the locus of P?

Exploring Diagonals

Age 11 to 16

This resource is part of "Dotty Grids - Exploring Coordinates and Vectors"

Move the top right-hand corner of the rectangle.
Can you work out what the purple number represents?



What would be the dimensions of a rectangle with a purple number of 24? Is there more than one?
If I tell you the coordinates, can you find a quick way to work out the purple number?

What other interesting questions might you explore?

The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
Copyright © 1997 - 2023. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project.