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The game of sim is an easy-to-learn pencil and paper game of drawing lines and avoiding triangles. Unlike many other similar pencil and paper games, there is always a winner!

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The Impossible Domino Tower Puzzle asks, “Can you arrange 16 dominoes to build this seemingly impossible domino tower?” This domino puzzle might look familiar because I tackled a similar puzzle, the Impossible Domino Bridge, with my students back in September. My students loved the challenge of building with dominoes. So when I saw that Ivan …

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One of the end-of-year activities I did with my statistics students was to explore the four color theorem. One of my students had been begging for weeks for me to let them color. I don’t think this was what she had in mind… Of course, I didn’t tell them the name of the theorem. I …

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I ran across the game of Wild Tic Tac Toe while researching Tic Tac Toe variants for my classroom. Wild Tic Tac Toe is the same as regular tic tac toe, except that on your turn you may place either an X or an O – your choice – in an empty cell. If this …

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What happens when you combine tic tac toe with a dice game? I was excited to discover this Tic Tac Toe Dice game in the book Dice Games by John Belton and Joella Crambit (1976). I was so excited about it that I typed up a PDF version to use with my students before I …

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I was super excited to discover a mathematical variation of tic-tac-toe. Instead of playing with Xs and Os, Numerical Tic Tac Toe is a game of evens vs odds. I printed the even and odd numbers on different colors of paper to make it super clear which numbers belong to each person. You might have …

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A few weeks ago, I posted the Tic Tac Toe Challenge for my students to tackle. After students solved the puzzle, they often ended up using the grid on the board to play regular tic tac toe. The puzzle only uses X’s, so students would end up drawing in the O’s with a dry erase …

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I’m super excited about using this ink stain matching activity as a first day of school activity for next year. It’s a great conversation starter, and I can see it being used in many different types of classrooms and subjects as a beginning of year team-building activity. If you are still in school and looking …

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Lonesome Llama is an excellent first day of school activity/first week of school activity to teach students how to effectively communicate in a group. The activity is from IMP (Interactive Mathematics Program) Groups of students are provided with a deck of cards. Each card features a different llama’s house. Students must work together to figure …

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Several summers ago, I created a DIY Instant Insanity Puzzle as part of my summer quest to create as many puzzles as possible using a bag of 1 inch wooden cubes. That summer, I created and blogged about SOMA Block Challenges, Genius Blocks, and the Three Immovable Pentablocks Puzzle. I never got around to blogging …

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Most likely, you’ve ran across some variation of the two buckets puzzle at some time in your life. You have two buckets. One bucket holds exactly five gallons. The other bucket holds exactly three gallons. How can you measure exactly four gallons of water into the five gallon bucket? Groupwork Norms for the Two Buckets …

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This collection of 97 printable tangram puzzles will make it super-easy to implement tangram puzzles as a problem-solving activity in your classroom. What are Tangrams? Tangrams are a dissection puzzle which is believed to originate from imperial China. A set of tangrams consists of seven flat shapes which can be put together to form a …

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Today I’m excited to share the 20 x 9 Challenge with you and your students. Last summer, I picked up a copy of Pierre Berloquin’s 100 Numerical Games at Goodwill for a couple of dollars. It’s turned out to be a good investment because it has served as inspiration for several fun classroom challenges. Want to …

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