Triangle Chain Puzzle
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Can you place the numbers 1-9 correctly in this math logic puzzle involving a chain of triangles?

Want some more math puzzling fun involving triangles ? Check out the Triangle Sums Puzzle as well!
Instructions
Place the numbers 1 to 9 in the spaces provided so that the sum of the numbers placed on the vertices of each triangle have a sum of 13. Two of the numbers (3 and 5) have already been placed for you.
You might need to teach your students the meaning of the phrase “vertices” depending on their age/experience learning geometry.
Puzzle Source
This puzzle is from a collection of 199 different mathematical puzzles offered as a free download from IREM de Lyon. This is a top-notch puzzle resource if you speak French.
I sadly do not speak French, but I was able to use the Google Translate app to translate quite a few of the puzzle instructions in order to use them in my classroom. Other puzzles I typed up from this same resource is the U Sums Puzzle, Magic H Puzzle, Lines of 3 Puzzle, 4 x 4 Checkered Square Puzzle, Equal Sums Puzzle, Square Sums Puzzle, Product Square Puzzle, and the popular Loops Puzzle.
This specific puzzle is #132 – Chaîne de triangles.
Printing and Prepping the Puzzle
This puzzle is designed to print on letter-sized 8.5 x 11 inch paper, but you could easily scale it to print on A4 paper as well.
If you wanted to, you could skip the circular number tiles and have students write in the numbers on their own copy of the puzzle. I would recommend sliding the puzzle in a dry erase pocket if you do end up going this route!
I used this puzzle last year in my classroom as one of my Puzzles of the Week. I prepared several copies of the puzzle and hung it on my dry erase board using a Charles Leonard magnetic pocket which I picked up from Amazon. They have been a real game-changer in my classroom organization!
Free Download of Triangle Chain Puzzle
The Triangle Chain Puzzle is available to download in both PDF format and as an editable PUB file. In order to edit the file, you will need to make sure you have Microsoft Publisher installed on your computer.
Click here to Download
Triangle Chain Puzzle (PDF)
2409 downloads – 276.29 KB
Click here to Download
Triangle Chain Puzzle (Editable Publisher File ZIP)
919 downloads – 1.34 MB
Puzzle Solutions
Puzzle solutions are available on a password-protected solution page. I do not openly post the puzzle answer keys because one of my goals as a resource creator is to craft learning experiences for students that are non-google-able. I want teachers to be able to use these puzzles in their classrooms without the solutions being found easily on the Internet.
Please email me at sarah@mathequalslove.net for the password to the answer key database featuring all of my printable puzzles and math worksheets. I frequently have students emailing me for the answer key, so please specify in your email what school you teach at and what subjects you teach. If you do not provide these details, I will not be able to send you the password.
Not a teacher? Go ahead and send me an email as well. Just let me know what you are using the puzzles for. I am continually in awe of how many people are using these puzzles with scouting groups, with senior adults battling dementia, or as fun activities in their workplace. Just give me enough details so I know you are not a student looking for answers to the puzzle that was assigned as their homework!