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Tangram Paradox

How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!

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?

Four Triangles Puzzle

Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?

Carroll Diagrams

Age 5 to 11 Challenge Level:

Have a go at filling in these Carroll Diagrams. 
You could print off these sheets: First.pdf  and Second.pdf.

Can you explain how you know where to place the numbers?