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The 9-10-11-12 Challenge is actually four puzzles in one. Can you arrange the numbers 1 through 6 in the spaces of the triangular shape below so that each side sums to 9? Repeat the challenge for sums of 10, 11, and 12.
I learned of this challenge from a collection of brainteasers that is no longer online. Luckily, an archived version of the website still exists.
They called the activity “Stop Clownin’ Around.” I didn’t really want to keep the balloon theme, so I renamed it the 9-10-11-12 Challenge.
Pre-pandemic, when I originally typed this puzzle up, I planned to use it on my puzzle table with laminated number pieces for students to move around.
The template above will work for each part of the 9-10-11-12 Challenge, but I decided to go ahead and make separate challenges as well.
I’ve recently learned that these puzzles are actually known as Magic Triangle Puzzles since each side of the triangle adds up to the same value. These are similar to Magic Square Puzzles.
Digital Versions of 9-10-11-12 Challenge
Since we still seem to be living in a pandemic, I also created digital versions of the 9-10-11-12 Challenge.
I got a little too excited when making this and decided that each challenge needed its own color.
Here’s the link to make a copy of this google slides version of the 9-10-11-12 Challenge.
I also created a Jamboard version of the challenge.
Want more puzzles? Check out my puzzles page!
Free Download of PDF Version of 9-10-11-12 Challenge
9-10-11-12 Challenge (PDF) (2967 downloads)
9-10-11-12 Challenge (Editable Publisher File ZIP) (556 downloads)
I intentionally do not make answers to the printable math puzzles I share on my blog available online because I strive to provide learning experiences for my students that are non-google-able. I would like other teachers to be able to use these puzzles in their classrooms as well without the solutions being easily found on the Internet.
However, I do recognize that us teachers are busy people and sometimes need to quickly reference an answer key to see if a student has solved a puzzle correctly or to see if they have interpreted the instructions properly.
If you are a teacher who is using these puzzles in your classroom, please send me an email at email@example.com with information about what you teach and where you teach. I will be happy to forward an answer key to you.