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#### Circus Tent Puzzle

##### (MathPickle, 2015)
This puzzle links geometry and arithmetic. For younger students, manipulatives are needed or the teacher must retain control. This is because young students will make too many mistakes doing free-hand drawings. Junior high students can learn to sketch equilateral triangles and insure that the sum of angles meeting at a point adds to 360 degrees.

#### Circus Tent Puzzle II

##### (Glen Whitney, 2021)

Glen Whitney suggested a generalized problem that you pay \$n for a regular n-sided polygon. I recommend his version for older children because there are aha! moments regarding pentagons, hexagons and bigger polygons. For younger children working with manipulatives, the original Circus Tent Puzzle that uses only \$3 triangles and \$4 squares is going to be both more cost-effective and makes talking about the sums of angles around a point easier. Both puzzles turn out to be equally challenging.

#### Standards for Mathematical Practice

MathPickle puzzle and game designs engage a wide spectrum of student abilities while targeting the following Standards for Mathematical Practice:

##### MP1 Toughen up!

Students develop grit and resiliency in the face of nasty, thorny problems. It is the most sought after skill for our students.

##### MP2 Think abstractly!

Students take problems and reformat them mathematically. This is helpful because mathematics lets them use powerful operations like addition.

##### MP3 Work together!

Students discuss their strategies to collaboratively solve a problem and identify missteps in a failed solution. MathPickle recommends pairing up students for all its puzzles.

##### MP4 Model reality!

Students create a model that mimics the real world. Discoveries made by manipulating the model often hint at something in the real world.

##### MP5 Know the tools.

Students master the tools at their fingertips - whether it's a pencil or an online app.

##### MP6 Be precise!

Students learn to communicate using precise terminology. MathPickle encourages students not only to use the precise terms of others, but to invent and rigorously define their own terms.

##### MP7 Be observant!

Students learn to identify patterns. This is one of the things that the human brain does very well. We sometimes even identify patterns that don't really exist 😉

##### MP8 Be lazy!?!

Students learn to seek for shortcuts. Why would you want to add the numbers one through a hundred if you can find an easier way to do it?

Please use MathPickle in your classrooms. If you have improvements to make, please contact me. I'll give you credit and kudos 😉 For a free poster of MathPickle's ideas on elementary math education go here.