# Activity

## Skyscrapers

This week’s activity features a city planner creating an urban neighborhood populated by skyscrapers of different heights. We will be exploring the problem as presented by Julia Robinson Mathematics Festival (JRMF) through an online applet. We will also be giving some tips to get students started with this activity. Facebook Twitter Click here for the …

## Prejudiced Polygons

This week’s activity features a neighborhood populated by Squares and Triangles that are slightly “shapist” (but only slightly) and don’t seem to coexist too well.  We’ll be exploring “Parable of the Polygons” by Vi Hart and Nicky Case and giving some tips to get students started with this activity. Facebook Twitter Click here for the …

## Frog Jumping & Stack Up

This week’s activity is a great puzzle to work on with materials lying around the house, or using our online applet.  This problem was first inspired by MathPickle.com and their activity Jumping Frogs, with Stack Up developed by the Julia Robinson Mathematics Festival and the Math Teachers’ Circle Network. Facebook Twitter Jumping Frogs The main goal of this …

## Humans, Zombies, & Other Problems crossing the river

This activity takes a couple of classic logic puzzles and adapts them to better suit K-12 audiences. It was designed in the Desmos Activity Builder, so it can be played online and easily given to a classroom of students. The activity as presented was developed at the San Francisco Math Circle, and was recently featured on …

## Puppies & Kittens and Queens Move

For this week, we’re going to look at two very different activities that show a surprising result when presented together. Puppies and Kittens was first presented by Paul Zeitz for the Math Teachers’ Circle Network, and Queen’s Move is more commonly known as Wythoff’s game. Share on facebook Facebook Share on twitter Twitter Puppies & kittens …

Here’s a great activity to impress students, friends, and family and show off what you can do with a little bit of creativity and some clever mathematics. This activity as presented was developed at the San Francisco Math Circle. Facebook Twitter To start this activity you need four cards with numbers written out as so: For …

## Let’s Make A Deal with Monty!

Share on facebook Facebook Share on twitter Twitter A prize is hidden behind one of three doors.  You choose the door where you think the prize is hidden. But before the door is opened, one of the other 2 remaining doors is opened to reveal no prize.  You must now decide to keep your original …

## An Endless Story

Share on facebook Facebook Share on twitter Twitter Do stories repeat?  They most certainly do on a Möbius strip!  The Möbius strip, or Möbius band, is named after August Ferdinand Möbius, a 19th century German mathematician and astronomer who was a pioneer in the field of topology. (The strip was also discovered independently at around …

## Remainder Patches!

Share on facebook Facebook Share on twitter Twitter This fun activity, suggested for Grades 2 – 6,  has students visually discover why some division problems end up with remainders and some do not by filling paper “quilts” with paper “patches.”  Win the game with the most leftover “remainder patches”! Quilt Quilt Patches Materials (for each …

## Tricky Tactics with Tangrams!

Share on facebook Facebook Share on twitter Twitter For centuries, people have been fascinated by tangrams, a Chinese puzzle consisting of pictures made from seven specific geometric shapes known as “tans,” or “pieces of cleverness.” But even if you’re aren’t familiar with Tangrams, what are they and how do they relate to math? This week’s …

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