You may also like

Tangrams

Can you make five differently sized squares from the interactive tangram pieces?

Baked Bean Cans

Is there a best way to stack cans? What do different supermarkets do? How high can you safely stack the cans?

Three Squares

What is the greatest number of squares you can make by overlapping three squares?

Rectangles with Dominoes

Age 5 to 7
Challenge Level

Sam, Ben from Matthew Arnold School, and Rohaan from Long Bay Primary School in New Zealand all noticed that you can make a rectangle using any number of dominoes. Here is what Ben said:

It is possible to make a rectangle with any number of dominoes. You simply lay them end to end so that the resulting rectangle gets longer and longer.

Of course, there are lots of more interesting ways to make rectangles; why not try to find some? 
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.