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Time to get a big more hands on and practical for this maths investigation, Year 4. Below there are 9 triangles - each side of the triangle is a number and a colour. You have to arrange these 9 smaller triangles into one big triangle like this;


Easy peasy, right! Well here's the challenge - any sides of the smaller triangles that face each other have to - 

1) Be the same colour.

2) Add up to 10.


You can have any colour or number on the outside edge.The number nine is written with a straight line down the side, and six has a curl, so you don't mix them up.




The triangles as a pdf