One Big Triangle

Stage: 1 Challenge Level: Challenge Level:1

Make one big triangle so the numbers that touch on the small triangles add to $10$.

You can click on the small coloured triangles and then drag them into the large empty triangle.

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You can also print out these triangles, cut them out and rearrange them to make the big triangle.


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Published April 2001,March 2009,April 2009.