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One Big Triangle

Age 5 to 7 Challenge Level:

Drag and drop these triangles so that the numbers that touch add up to $10$
Try to use all the small triangles and move them to fill in all the spaces in the big triangle.

Full screen version

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

Here is a printable version with 10 frames.