Tangrams
Stage: 1 Challenge Level: 
Can you make five differently sized squares from the tangram pieces?
Tea Cups
Stage: 2 and 3 Challenge Level:
Place the 16 different combinations of cup/saucer in this 4 by 4 arrangement so that no row or column contains more than one cup or saucer of the same colour.
Teddy Town
Stage: 1, 2 and 3 Challenge Level:
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?
Zios and Zepts
Stage: 2 Challenge Level:
On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?
Same Length Trains
Stage: 1 Challenge Level:
How many trains can you make which are the same length as Matt's, using rods that are identical?
Find the Difference
Stage: 1 Challenge Level:
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
How Would We Count?
Stage: 1 and 2 Challenge Level:
An activity centred around observations of dots and how we visualise number arrangement patterns.
Build it Up
Stage: 2 Challenge Level:
Can you find all the ways to get 15 at the top of this triangle of numbers?
NRICH is part of the family of activities in the Millennium Mathematics Project.