David Klein – MathCircles.org

Queen’s Move

By:

Topic(s):

Combinatorics, Geometry, Mathematical Games, Number Theory, Problem Solving / General

Supporting Resources:

Facilitator Guides, Handouts, Photos & Videos, References

Students will explore a game between two players moving a chess Queen from place to place on a square grid. The Queen may move any number of spaces to the left, any number of spaces downward, and any number of spaces on the downward-left pointing diagonal. Each player takes turns...

Bubbling Cauldrons

By:

David Klein, Gord Hamilton, Spencer Bowen

Topic(s):

Algebra / Arithmetic, Mathematical Modeling, Problem Solving / General

Supporting Resources:

Facilitator Guides, Handouts, Photos & Videos, References, Virtual Tools

Place our numbers into the cauldrons in ascending order – you can choose which cauldron each one goes in. However, if two numbers in one cauldron add up to a third number in that same cauldron, they bubble up and cause an explosion! This means that all the numbers, leave...

Monty Hall Problem

By:

David Klein, Spencer Bowen

Topic(s):

Mathematical Games, Probability and Statistics

Supporting Resources:

Facilitator Guides, Handouts

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 can choose to keep the door you chose earlier or...

Humans, Zombies, & Other Problems Crossing the River

By:

David Klein, Javier Haro, Spencer Bowen

Topic(s):

Mathematical Modeling, Problem Solving / General

Supporting Resources:

Facilitator Guides, Photos & Videos, Virtual Tools

A town faces an epidemic of zombies! Luckily, the virus has just started to spread and the infected are able to stave off their hunger for human brains… for now. In fact, they’re willing to work alongside the remaining humans to help them get across a river to safety. Can...

Gerrymandering

By:

David Klein, Spencer Bowen

Topic(s):

Algebra / Arithmetic, Combinatorics, Mathematical Games, Mathematical Modeling, Problem Solving / General

Supporting Resources:

Facilitator Guides, Handouts, Photos & Videos, References, Virtual Tools

Merriam Webster defines gerrymandering as “the practice of dividing or arranging a territorial unit into election districts in a way that gives one political party an unfair advantage in elections.” This activity tries to make sense of that definition using a few examples.

Activity Database

Queen’s Move

Bubbling Cauldrons

Monty Hall Problem

Humans, Zombies, & Other Problems Crossing the River

Gerrymandering