Previous Additions to the Forum
October - December 2009

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2010 Mathematics Game (25 December 2009)
Write expressions for each of the counting numbers 1 through 100, using the digits in the year 2010, standard operations, and grouping symbols. You may use the digits in any order, but the order 2, 0, 1, 0 is preferred. This year we will also allow the use of decimal points and double-digit numbers. This puzzle is appropriate for students in grades 3-12 with a general knowledge of mathematics.

Students may use the Web form to submit solutions starting January 1, 2010; revisit the site after February 1, 2010, to see the first solutions.

Pages available for printing:

Rules of the Game
Manipulative Worksheet

KenKen® at the Math Forum (11 December 2009)
The Math Forum is excited to partner with Nextoy® to offer a collection of KenKen puzzles. KenKen is a number puzzle related to Sudoku, but even more mathematical. We have puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations.

KenKen puzzles offer great opportunities:

  • to practice arithmetic skills in new and interesting ways
  • to learn and get better at problem-solving strategies
  • to work on organizing and communicating mathematical ideas

KenKen puzzles are free with registration. If you're already a Math Forum PoW member, you already have access to KenKen puzzles--just use your PoW login information where prompted.

Each puzzle comes with a printer-friendly view, an interface for submitting your work, and a solution viewable by teachers. Teachers with class accounts may further view the work their students submit when solving KenKen puzzles.

We allow uploads in answer submissions, which makes it much easier to show KenKen work (or even steps, moments of reflection, etc.). And we offer a table-making tool in the explanation box, for an alternate method of displaying similar information.

The site includes:

  • Introduction to KenKen
  • Lesson Plans
  • Rules
  • Discussion
  • Tutorial


The Math Forum @ Drexel at CMC-North (27 November 2009)
Coming to Asilomar December 4-6 for the California Mathematics Council's northern meeting? Suzanne Alejandre, Math Forum Director of Professional Development, will present a session on Saturday:

The Math Forum @ Drexel: Learning Math Together
Learn about and discuss activities designed to help students develop and deepen their use of mathematical problem-solving and communication. Help students connect to their own way of thinking, build their ideas and experiences, and develop confidence in problem-solving. Become familiar with our activities including, Forget the Question, Try It, In Your Own Words, and PoW IQ, that each can be used with any curriculum to help students approach problem solving from a wide variety of angles!

Session 262
9:30 - 10:30 Saturday
Pacific Grove High School, Room B3

For more about the conference, visit CMC's conference page.

Seasonal Math Forum Problems of the Week (27 November 2009)
Looking for problem solving prompts with a seasonal theme?

  • Are You Ready for Some Football? - 3520
  • Johnny's Orchards - 3316
  • Falling Leaves - 3248
  • Apple Picking - 4544
  • Shine On Harvest Moon - 434
  • Winter Is Coming! - 3227
  • Snow Day! - 3431
  • Snowy Footprints - 5003
  • Make the Save! - 3556
  • What's the Temperature? - 2992
  • Throw It Down! - 3664
  • Let It Snow! - 4600
  • The Great Northern Triathlon - 4096
  • Heating the Tub - 3604
  • Adrienne's Axel - 976
  • Winter Gold - 1936
  • Shannell's Holiday Treats - 1840
  • The Christmas Gifts - 988
  • Holiday Dance - 3592

If you have a PoW Membership that includes access to our Problems Library, view these problems by entering their three- or four-digit numbers to the left of the "Go" button on the main Library page.

Do you have an Individual Teacher account? Would you like access to the past PoWs listed above--plus hundreds more? Contact us. We're happy to take the $25 that you originally spent on your individual membership, and apply that toward upgrading you to a Class account.

If you are not a member, consider a free Trial Account.

IAS/PCMI Applications and Information, Summer 2010 (20 November 2009)
The 2010 Summer Session of the IAS/Park City Mathematics Institute will be held in Park City, Utah, from June 27–July 17, 2010.This three-week residential program is organized into seven groups:

  • Clay Senior Scholars in Residence
  • Graduate Summer School
  • International Seminar in Mathematics Education
  • Research Program in Mathematics
  • Secondary School Teachers Program
  • Undergraduate Faculty Program
  • Undergraduate Summer School

These groups meet simultaneously, pursuing both individual courses of study and a meaningful amount of interaction. The rich mathematical experience combined with interaction among all participants results in greatly increased understanding and awareness of the issues confronting mathematics and mathematics education today.

The research topic for 2010 is "Image Processing" and the education topic is "Making Mathematical Connections."

Teachers are given full support and a stipend during the Summer Session. In addition, 6 quarter-credits of 400-level mathematics are available from the University of Washington for a nominal fee.

Learn more about the Secondary School Teachers Program by viewing the information posted from previous years on the PCMI@MathForum site:

Deadline for submission of applications is January 31, 2010. The IAS/Park City Mathematics Institute is an outreach program of the School of Mathematics at the Institute for Advanced Study (IAS) in Princeton, New Jersey.

Delaware: Middle School Math Intervention Series (16 November 2009)
Annie Fetter, Max Ray, and Suzanne Alejandre facilitated a workshop on the Problem Solving and Communication Activity Series from the Math Forum's Problems of the Week program.
Financial Literacy Learning Center (November 2009)
Math Forum staff are developing a Financial Literacy Learning Center for grades 6-12, funded by Financial Industry Regulatory Authority (FINRA). The center will support teachers in developing problem solving, critical thinking, and communication skills focused on financial literacy using the Math Forum's pedagogical approach.


The Math Forum @ Drexel at CMC-South (30 October 2009)
Coming to Palm Springs next weekend? Drop by the Math Forum booth in the Exhibit Hall to meet Suzanne Alejandre, Math Forum Director of Professional Development, and Marie Hogan, math teacher at Traweek Middle School in West Covina, and long-time user of the Math Forum.

Suzanne and Marie will present a session together on Saturday:

The Math Forum @ Drexel: People Learning Math Together
The Math Forum, home of Ask Dr. Math, has been the leading online resource for improving mathematics learning, teaching, and communication since 1992. What does this community offer you and your students?

Session 740
For teachers of grades 3-12
1:15 - 2:45 Saturday
Convention Center, Primrose D

For more about the conference, visit CMC's conference page.

Free Mentoring Opportunities (30 October 2009)
A mentor group will be providing feedback to submitters in upcoming problems opening on these dates:
NCTM Regional Conference, Boston (21-23 October 2009)
Coming to Boston for the NCTM Regional Conference? Stop by Booth #429 to meet Parker Molden or Claire Mead. While you're there, enter a drawing for a one-year class membership in the Problems of the Week.

Claire will present a session with co-speaker Mary Taylor, of Israel Loring Elementary School, Sudbury, MA:

Using Rich Problems to Reach All Learners (Session 241)

For teachers and math coaches/coordinators, Grades 3-8
Fri, Oct 23, 12:30pm - 1:30pm
Convention Center Room 301
In their session, Claire and Mary will share strategies for using rich problems to reach a wide range of learners. Such problems invite a variety of solution strategies and provide a natural vehicle for differentiating math instruction. They build concepts and skills for struggling students and offer challenge to those who soar.

Delco CFF Math Collaboration Day (15 October 2009)
Math Forum Internet Eductation Specialist Steve Risberg presented the sessions "Teaching Students to Problem Solve" and "Enhancing Instruction with Technology" at the Delaware County Classrooms for the Future (CFF) Math Collaboration Day.
Bring Geometry to Life with Google Sketchup (8 October 2009)
Google SketchUp is a free, fun, easy-to-use 3D modeling application. Originally created for architects and designers, SketchUp is also a great tool for teaching geometry.

3DVinci, hosted by the Math Forum, offers resources to help you do just that:

  • Projects of the Month
  • videos
  • teacher resources and guide
  • 2D and 3D project books
  • blog
  • geometry tips and projects
  • SketchUp Training Videos: Google-produced videos on SketchUp, from getting started through advanced topics
  • forums and discussion groups
The Math Forum @ Drexel at PAESSP (5 October 2009)
Director of Professional Development Suzanne Alejandre exhibited at the Pennsylvania Association of Elementary and Secondary Principals (PAESSP) State Conference, State College, PA. She joined Aimee Topping and Wendy Elliott-Pyle, both from the School of Education.
Haddonfield Memorial High School (October 2009)
The Math Forum is engaged in a year-long program to support the development of higher order thinking skills and the differentiation of instruction in classes with a wide range of learning abilities, based on the online Problems of the Week program, as part of the collaboration between Drexel University and Haddonfield Memorial High School.
MathPath Project (October 2009)
The Math Forum and its partner, Maryland PBS, received a National Science Digital Library Pathways grant for its MathPath project, an elementary math learning resource. Work will begin in January 2010. Projected products are to include a lesson planner, personal resource collection, Action Research tool, and classroom videos.

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