Last Saturday we had the first of four Boise Math Teachers’ Circle meetings for 2016–2017. The four-hour session contained an in-depth look at three different math problems: one in geometry, one in number theory, and one in topology. Continue reading Math Teacher’s Circle–Ellipses, coins, and fractals

# Adding together infinitely many numbers

It is often necessary to add more than two numbers together. For example, you might have made 137 deposits to your bank account this year, and wonder how much you contributed in total. But is it possible to add infinitely many numbers together? The answer is that sometimes it is possible, and sometimes it isn’t! In this discussion we investigated when, why, and how! Continue reading Adding together infinitely many numbers

# Boise Math Teachers’ Circle recruiting for 2016-2017

The Boise Math Teachers’ Circle is excited to announce our program for the 2016–17 school year! The BMTC is open to K–12 mathematics educators. We will meet four Saturdays, for four hours each, to discover exciting math concepts and tackle challenging math problems together.

### Our session dates

- Saturday, October 22, 2016
- Saturday, January 21, 2017
- Saturday, February 25, 2017
- Saturday, April 15, 2017

# Ovals upon ovals!

A circle has a center c and a radius r. The points on the circle are all a distance of exactly r units from c. What if we start with **two** fixed center points? The set of points on an **ellipse** have a fixed sum-distance to two center points c1 and c2 (called foci). An ellipse has kind of an oval shape. Ellipses occur in nature – the Earth’s orbit is not a perfect circle but rather an ellipse, with the Sun being just one of the two foci.

In this activity we investigated how to draw ellipses using pushpins and string. We also asked whether it is possible to have more than two fixed center points. Continue reading Ovals upon ovals!

# Mars moon mission

Suppose you are sending a crew of scientists to the moons of Mars: Phobos and Deimos. The scientists are botanists, geologists, and mathematicians, or any combination of the three. You want to divide the crew into to halves so that each moon gets an equal number of each scientists. When can this be done? Continue reading Mars moon mission

# The BMC is now recruiting for 2016–17

The Boise Math Circle is excited to announce we’ll be continuing our program throughout the 2016–17 school year! The BMC is open to middle and high school students with some experience in algebra. If you like solving problems and want to learn more about the creative side of math, please consider applying. If you have a friend that does, invite them to apply too!

We will begin on Saturday morning, September 10, and meet approximately every two weeks. See our schedule of meeting dates.

- More About the Boise Math Circle
- Program Directors
- Schedule of Circle Meetings
- Recent Circle Meetings
- Printable BMC Flyer
**Apply Now!**

## Teachers

Please help us recruit participants by letting your students know about the program. If you’d like attendance reports for your students (e.g., for extra credit), please send us an email. You’re of course welcome to join the sessions.

# The game SET

The card game SET is well-known amongst game players. Each card has four characteristics, and each characteristic has three outcomes. Twelve cards are placed face up, and players try to find a set of three cards with each characteristic all the same or all different. It turns out there is a lot of math going on! For example, are twelve cards enough to guarantee you will be able to find a set? If not how many do you need? Continue reading The game SET

# Cave person games

What kinds of games can be played using just stones? It turns out quite a few! In this session we investigated three games in particular. Continue reading Cave person games

# Taking in the whole room

Suppose you have a room, and you need to guard it using ceiling mounted cameras. Assume the cameras can see in 360 degrees. If the room is very simple, such as a square shape, you can get away with just one. But if the room is more complicated, say with nooks and crannies, you may need many cameras. How can you find how many? Continue reading Taking in the whole room

# Multiplying points in the plane

It is easy to add points in the plane “coordinatewise”, that is, by writing (x,y)+(z,w)=(x+z,y+w). This even has a very nice geometric interpretation: completing the parallelogram with first three corners (0,0), (x,y), and (z,w). But it isn’t easy to multiply points because the simple rule (x,y)*(z,w)=(xz,yw) doesn’t allow division. In this activity we looked for something better. Continue reading Multiplying points in the plane