September 2011, Bard Math Circle

September 24, 2011March 9, 2019

May Problem and Solution!!!

Hey Guys! In May of 2011 the Bard Math Circle visited the Kingston Library and challenged the enthusiastic students to solve a series of combination/permutation problems. Although tough, the problems proved to be quite the adventure for the talented youth. One of the problems asked to find the different ways that four friends could split into two group (groups can be uneven) if they were to play a game. Here is the problem:

Four friends, Andrew, Brianna, Cassandra, and Darien want to

play a game. How many ways can they form two teams? Every-

one must play.

Example: Andrew, Cassandra, Darien vs. Brianna .

This is the same as Brianna vs. Darien, Andrew, Cassandra

Actually, this is a similar situation to my 2011 Summer at Bard College adventures with three friends of mine (Anam, Andres, Mauricio). We were having a dance competition and we could either partner up in a group or give a solo performance. We first gave everyone the chance to prove themselves the best dancer. This gave us four groups. Next, Anam got a partner. She had three dances with a partner. Then, Andres had the chance to get a partner as well and he danced only twice (he had already danced with Anam). Later, Mauricio had to get a partner and he only danced with me (he had already danced with Andres and Anam). When it was my turn, I realized I had already danced with all of them and I was too tired of dancing. Nonetheless, it was a fun night and full of laughs, combinations, and math.

It turns out the number of groups we could create was 7. We could abbreviate Andrew as A, Brianna as B, Cassandra as C, and Darien as D. Then the example Andrew, Cassandra, Darien vs. Brianna could be written as ACD|B. To make things easy, let’s agree to always list Andrew’s team first:

A|BCD
AB|CD
AC|BD
AD|BC
ABC|D
ABD|C
ACD|B

For further information on combination and permutation problems, the following website can help http://www.mathsisfun.com/combinatorics/combinations-permutations.html

If you are looking for more practice the following is very helpful http://www.regentsprep.org/Regents/math/algtrig/ATS5/PCPrac.htm

September 16, 2011March 9, 2019

Bard Math Circle at the Red Hook Public Library

The Bard Math Circle will be traveling to the Red Hook Public Library on September 16th from 5:00-7:00! There is a brand-new, beautiful Children’s Library in the basement of the building, which will serve as a great space for us.

Come and play some games, dissect some squares, and learn some strategies!

(I challenge everyone to a game of Set.)

September 11, 2011March 9, 2019

Bard Math Circle at Kingston Library – more highlights

We had our first math circle of the year yesterday at the Kingston Library. This circle meets on the 2nd Saturday of each month, so:

Second Saturdays, 1-3pm at the Kingston Library, 55 Franklin Street, Kingston NY 12401
2011: September 10, October 8, November 12, December 17
2012: January 14, February 11, March 10, April 14, May 12

Here are some of the mathematical highlights:

Area Puzzles

The problem sheet this month had dissection problems. Goal: cut each shape into pieces and rearrange them into a square. How few pieces can you use?

Dragon Illusion

The hands-on math take-away was a dragon illusion. Here’s a video that I made of the one I assembled:

//www.youtube.com/get_player
As you can see, the dragon’s head appears to follow you as you move from side-to-side. This illusion was designed by Jerry Andrus, and you can download your copy here: http://www.g4g-com.org/storage/Dragon-Illusion-GG2010.pdf. If you’re interested in a mathematical adventure, find out who Jerry Andrus is, and what is “GG2010”, which is short for Gathering for Gardner 2010!

The Game of 21-Nim

Jeannette taught us all how to play a game called 21-Nim. This is a game for two players, played with a pile of 21 counters. On your move you can remove 1, 2 or 3 counters, and whoever takes the last counter wins. After explaining the rules, Jeannette gave everyone a chance to play, and finished by analyzing strategies.

We’ll be playing 21-Nim at several of our circles this month, so come out and play!

September 11, 2011March 9, 2019

Yesterday my children and I attended the Math Circle at Kingston Library. On the way home I asked them each what their favorite part of the Math Circle was. Jordan said ” When I beat Jeannette at 21 Nim!” followed by her trademark giggle. Michael enjoyed the time the Xingye spent with him explaining square roots and especially liked that Xingye signed his cast in Chinese. Alisa liked playing with the magnetic shapes. I loved all the energy in the room and seeing parents and children having fun using their math skills!

September 1, 2011March 9, 2019

Kingston Library Circle: 2nd Saturdays this year!

The Bard Math Circle at the Kingston Public Library starts again on Saturday, September 10th, and continues through May on the 2nd Saturday of each month.

This math circle is targeted towards middle-school aged students, but everyone (especially families and math teachers) is welcome! Our goals include building mathematical intuition, insight, involvement and engagement. We encourage students to work together, to develop their mathematical communication skills, and to become part of a mathematical community.

We’ll continue our focus this year on:

Math Games and Logic Puzzles
Insightful Problems
Hands-on Math Takeaways

And new this year, we’ll have a special double-focus:

Solve the Rubik’s Cube: Bring your cube or borrow one of ours. We’ll learn an efficient solving method and then explore the mathematics behind the cube.
Game Theory: Starting with the classic game of Nim, we’ll explore game theory through this and other delightful games.

The Bard Math Circle at the Kingston Library is organized by Bard math professor Japheth Wood, and facilitated by Bard Math Majors. If you’re interested in assisting, contact Japheth: jwood@bard.edu.