Sixteen matchsticks form eight equal triangles.

The question: Can you take away four matchsticks and leave only four of these triangles?

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Question 2: Thirteen matchsticks form eight triangles (six small ones and two large ones).

Can you take away three matchsticks and leave only three triangles?

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Question 3: The nine matchsticks shown below form three equal triangles.

How can two matchsticks be moved to make four equal triangles?

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Question 4: The eighteen matchsticks shown below form thirteen triangles (nine small ones, three medium ones, and a large one).

Can you leave only seven of these thirteen triangles by taking away just three matchsticks?

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Question 5: The eighteen matchsticks shown below form thirteen triangles (nine small ones, three medium ones, and a large one).

Can you leave only three triangles, of varied sizes, by taking away six matchsticks?

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Question 6: These thirteen matchsticks form six equal triangles.

Can you leave only three of these six triangles by removing four matchsticks?

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