**Tulsa Math Teachers' Circle MEETINGS**

**September 4, 2014 **

**Facilitator**: Marilyn Howard, The University of Tulsa and Tulsa MTC

**Session Title**: **
Pathways Puzzle Problem from Summer/Autumn 2014 MTCircular
**

**Attendance**: Twenty-eight math educators

**Sponsor(s)**: The University of Tulsa College of Engineering and Natural Sciences and the American Institute of Mathematics, Math for America Seed Grant

**Handouts or Material Covered**: Copy of **Pathway Puzzle Problem** . We also used **Pascal’s Triangle **to help count the number of paths for grids without missing links.

This was the Math Circle contest puzzle from AIM. Our circle submitted the most entries and won five AIM mugs. Two members also won individual mugs for their unique entries: Spencer Pearson **(link to puzzle**) and Marilyn Howard (**link to puzzle**).

**October 2, 2014 **

**Facilitator**: Mark Brown, MidAmerica Nazarene University and Heartland MTC

**Session Title**: **
Intersection Math with ideas from James Tanton**

**Attendance**: Twenty-four math educators

**Sponsor(s**):The University of Tulsa College of Engineering and Natural Sciences and the American Institute of Mathematics, Math for America Seed Grant.

**Handouts or Material Covered**: Copy of** PowerPoint Presentation
** | **PDF version **.

We performed weird multiplication using __intersection math__, __rectangle math__, and __party math__, all of which turned out to be identical! They were all found by the ordinary multiplication of triangle numbers!

**November 6, 2014 **

**Facilitator**: Bill Coberly, The University of Tulsa and Tulsa Math Teachers' Circle

**Session Title**:

**Attendance**: Twenty-two math educators

Sponsor(s): The University of Tulsa College of Engineering and Natural Sciences and the American Institute of Mathematics, Math for America Seed Grant.

Number theory is one of the fundamental fields in mathematics. Properties of particular natural numbers and sequences of numbers have attracted the curiosity of mathematicians and the general public. In this session we explored surprising properties of some numbers noting the centennial of the birth of the late Martin Gardner, a Tulsa native, whose Scientific American monthly feature “Mathematical Games” and other writings popularized mathematics for over 50 years.

**Handouts or Material Covered**:** Lucky Number 2187**

At our November meeting we celebrated the life of Martin Gardner, a native Oklahoman and puzzle master extraordinaire, during the 100th anniversary of the year of his birth. Gardner was featured monthly in the *Mathematical Games* column of Scientific American. We found out that Martin Gardner lived at 2187 S. Owasso Ave, Tulsa, OK and that 2187 turns out to be 3^{7}, a lucky number, a Friedman number, and 10000000 in base 3. How cool is that?

**February 5, 2015**

**Facilitator**: Donna Farrior, The University of Tulsa and Tulsa Math Teachers' Circle

**Session Title**:

**Attendance**: Twenty-six math educators

**Sponsor(s)**: The University of Tulsa College of Engineering and Natural Sciences and the American Institute of Mathematics, Math for America Seed Grant, and Rib Crib

We spent the evening grappling with different types of logic problems, each requiring a different method for organizing given information. The puzzles we looked at were:

- Matrix puzzles in which one must describe entities by selecting items from various categories. A resource for these puzzles is www.Printable-Puzzles.com.
- A puzzle from
*Games World of Puzzles*magazine which resembled a matrix puzzle but used a tree diagram showing relations to solve easily. - The “Zebra Puzzle”, a well-known logic puzzle originally published in
*Life International*magazine in 1962. (https://www.cs.duke.edu/courses/spring06/cps102/notes/zebra.pdf) Here we changed tactics and used a process of elimination method to solve the puzzle. - A sampling of exercises from
*What is the Name of this Book?*by Raymond Smullyan including problems with Knights, Liars, and the Island of the Zombies. - Circle members were referred to “The Hardest Logic Puzzle Ever” so named by philosopher George Boolos (http://www.thebigquestions.com/boolos.pdf) . Members were encouraged to try their hand at this puzzle given the experience they now had with logic puzzles.

**April 2, 2015**

**Facilitator**: Paul Zeitz, The University of San Francisco, AIM Board of Directors, and Founder of the San Francisco Math Circle

**Session Title**:

**Attendance**: Thirty-two math educators

**Sponsor(s)**: The University of Tulsa College of Engineering and Natural Sciences and The Charles and Lynn Schustermann Family Foundation

**Description**: We learned how to do several dazzling magic tricks that required NO skill. These tricks with cards all used very simple mathematical principles, applied cleverly.

Handouts or Material Covered: Mathematical Magic for Muggles