Sponsored by Dominican University and by parent and community donations.

The Marin Math Circle brings together students who are interested in exploring new mathematical topics and challenging problems. We meet on Monday evenings during the school year on the campus of Dominican University of California. The Spring 2015 program will start on Monday, January 26.

Circle Level Time Room
Elementary Circle Recommended for grades 3 and 4 Mondays
6:30 - 7:20 pm
Guzman 110
Intermediate Circle Recommended for grades 5-8 Mondays
6:30 - 8:00 pm
Guzman 307
Advanced Circle Recommended for grades 9-12,
or advanced 8th graders
who are comfortable using algebra
6:40 - 8:10
Guzman 306

To receive email announcements about math circle sessions, please subscribe to the Marin Math Circle google group:
Subscribe to Marin Math Circle
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Come join us for puzzles like the ones below!   Want to see more problems?

There are 100 light switches on the wall, all turned off. A hundred toddlers come by. The first toddler flips every switch. Then the second toddler flips just switches 2, 4, 6, 8, ... etc. Then the third toddler flips switches 3, 6, 9, 12, ... etc. This pattern continues until finally the 100th toddler flips just switch number 100. How may lights are turned on at the end?

A military base has a number of identical hoverplanes. Each hoverplane can carry enough fuel to fly exactly halfway around the planet. Hoverplanes do not use any fuel while hovering stationary in the air, and hoverplanes can transfer any amount of fuel between each other while in the air. What is the minimum number of planes are that are needed so that one plane is able to get all the way around the planet and all assisting planes return safely to base?

What is the maximum number of pieces you can divide a watermelon into with four straight cuts, if you are NOT allowed to rearrange the pieces between cuts? With five cuts?


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