201415 Problem of the Week Calendar
Links to the Packets, suggested Activity Series strategies, and Online Resources (and more!) are available from the individual problem page (linked from the titles below). Access to the problems is restricted to users who have subscribed to one of our membership services. More information is available on our Pricing Guide.
Mentor groups (indicated by ) make it possible for more students to receive free mentoring than is normally possible. This list is updated throughout the year.
* Students can submit to problems any time after they open. However, only solutions submitted before the next problem opens will be considered for inclusion in the posted solutions for the Math Fundamentals, PreAlgebra, Algebra, Geometry, and Trig/Calc problems.
Teachers with Full Memberships or higher can also view the problems from the 201314 academic year.
[ Primary  Math Fundamentals  PreAlgebra  Algebra  Geometry  Trig/Calc ]
Primary  
Submissions Open 
Problem  Mentor Group 

Aug 25  Back to School  
Sep 8  Book Club  
Sep 22  Catching Minnows  
Oct 6  Colorful Candies  
Oct 20  A Walk at the Park  
Nov 3  Dog Packs  
Nov 17  Decorating Cookies  
Dec 1  Magic Rabbits  
Dec 15  Home On Time  
Jan 5  How Many Pinecones?  
Jan 19  Number Fun  
Feb 2  More Milk!  
Feb 16  Lunch Line  
Mar 2  New Pencils  
Mar 16  Pick 'em Up!  
Mar 30  Hannah's Cookies  
Apr 13  Gum for Everyone  
Apr 27  Gym Line  
May 11  Goody Bags  
May 25  Fourth of July  
Summer  
Jun 8  How Many Berries Did I Eat?  
Jun 22  Pizza Night  
Jul 6  Summer Problem 3  
Jul 20  Summer Problem 4  
Aug 3  Summer Problem 5  
Math Fundamentals  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Aug 18  Football Fanfare  Sep 5  
Sep 1  Mr. Lincoln's Line  Sep 19  
Sep 15  Birthday Trip  Oct 3  
Sep 29  Campfire Camaraderie  Oct 17  
Oct 13  So Many Salmon  Oct 31  
Oct 27  Subway Subtotals  Nov 14  
Nov 10  Pizza Dough  Nov 28  
Nov 24  Anthony's Famous Butter Rolls  Dec 12  
Dec 8  Elevator Weighin  Dec 26  
Dec 22  How Old is Santa Claus?  Jan 16  
Jan 12  Penny Dates  Jan 30  
Jan 26  Filling Beauty's Seats  Feb 13  
Feb 9  Dad's Cookies  Feb 27  
Feb 23  Cupcakes, Cupcakes!  Mar 13  
Mar 9  Frog Farming  Mar 27  
Mar 23  Teresa's Tiles  Apr 10  
Apr 6  Grampa Joe's Great Grandpets  Apr 24  
Apr 20  Salad Daze  May 8  
May 4  Count the Discount  May 22  
May 18  Cat Walk  Jun 5  
Summer  
Jun 1  Rugby Rules!  Jun 19  
Jun 15  The Kickball Tournament  Jul 10  
Jun 29  Eating Grapes  Jul 17  
Jul 13  Summer Problem 4  Jul 31  
Jul 27  Summer Problem 5  Aug 14  
Aug 10  Summer Problem 6  Aug 28  
PreAlgebra  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Aug 25  Boxes of Stationery  Sep 12  
Sep 8  Forming Triangles from a Folding Ruler  Sep 26  
Sep 22  Women's Walkway  Oct 10  
Oct 6  Integer Images  Oct 24  
Oct 20  3D Vision  Nov 7  
Nov 3  Falling Leaves  Nov 21  
Nov 17  The Nutty Squirrel  Dec 5  
Dec 1  Riz's Route  Dec 19  
Dec 15  Radical Darts  Jan 9  
Jan 5  A Happy New Year Wish  Jan 23  
Jan 19  Duke is Missing  Feb 6  
Feb 2  He Ate It All!  Feb 20  
Feb 16  A Pound of Valentine's Chocolate  Mar 6  
Mar 2  Tunnel Time  Mar 20  
Mar 16  Cynthia's Solitaire Challenge  Apr 3  
Mar 30  Mikey and Lily Eat Cereal  Apr 17  
Apr 13  Scale Stepping  May 1  
Apr 27  Change Woes  May 15  
May 11  Building Fences  May 29  
May 25  Ducky Promenade  Jun 12  
Summer  
Jun 8  Get Your Kicks on Route 66  Jun 26  
Jun 22  Timber!  Jul 10  
Jul 6  Summer Problem 3  Jul 24  
Jul 20  Summer Problem 4  Aug 7  
Aug 3  Summer Problem 5  Aug 21  
Algebra  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Aug 18  My Three Dogs  Sep 5  
Sep 1  Calendar Calculations  Sep 19  
Sep 15  Kristina's Code  Oct 3  
Sep 29  Baffling Brother  Oct 17  
Oct 13  What's the Difference?  Oct 31  
Oct 27  Splash!  Nov 14  
Nov 10  Dinner at Pepe's  Nov 28  
Nov 24  Time Trial Triumphs  Dec 12  
Dec 8  Heating the Tub  Dec 26  
Dec 22  To B or Not To B  Jan 16  
Jan 12  Sierpinski Stages  Jan 30  
Jan 26  Battle of the Bands  Feb 13  
Feb 9  Math Club Mystery  Feb 27  
Feb 23  Johnny's Orchards  Mar 13  
Mar 9  Splitting a Square  Mar 27  
Mar 23  What's the Temperature?  Apr 10  
Apr 6  Boxes of Cereal  Apr 24  
Apr 20  Poolish Pride?  May 8  
May 4  Cheap Sunglasses  May 22  
May 18  The Great Northern Triathlon  Jun 5  
Summer  
Jun 1  Time Trial Triumphs  Jun 19  
Jun 15  Triangle Probability  Jul 10  
Jun 29  Jimmy's Hits  Jul 17  
Jul 13  Summer Problem 4  Jul 31  
Jul 27  Summer Problem 5  Aug 14  
Aug 10  Summer Problem 6  Aug 28  
Geometry  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Aug 25  Fitting In  Sep 12  
Sep 8  Lost at Sea?  Sep 26  
Sep 22  Pentagon Puzzle  Oct 10  
Oct 6  Eminen  Oct 24  
Oct 20  Tied in Knots  Nov 7  
Nov 3  Cutting Corners  Nov 21  
Nov 17  How Many Angles?  Dec 5  
Dec 1  Assessing Seismic Risk  Dec 19  
Dec 15  TV Dimensions  Jan 9  
Jan 5  How Deep is It?  Jan 23  
Jan 19  So Many Similar Triangles!  Feb 6  
Feb 2  Four Point Puzzle  Feb 20  
Feb 16  Square in a Right Triangle  Mar 6  
Mar 2  Extending the Enneagon  Mar 20  
Mar 16  Voulez Vous des Voussoirs?  Apr 3  
Mar 30  The Perimeter of an Octagon  Apr 17  
Apr 13  Kyle's Similar Triangles  May 1  
Apr 27  Making a Map  May 15  
May 11  Spring Up, Fall Back  May 29  
May 25  Arc to Area  Jun 12  
Summer  
Jun 8  Dendrochronology  Jun 26  
Jun 22  Seeing Stars  Jul 10  
Jul 6  Summer Problem 3  Jul 24  
Jul 20  Summer Problem 4  Aug 7  
Aug 3  Summer Problem 5  Aug 21  
Trig/Calc  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Aug 18  Preparing for the Test  Sep 5  
Sep 1  Find the Function  Sep 19  
Sep 15  Is It a Midpoint?  Oct 3  
Sep 29  Up, Up, and Away (Part I)  Oct 17  
Oct 13  Up, Up, and Away (Part II)  Oct 31  
Oct 27  Can You Prove It?  Nov 14  
Nov 10  George's Gutters  Nov 28  
Nov 24  Skiing in Vermont  Dec 12  
Dec 8  Pie Puzzler  Dec 26  
Dec 22  A Rhyming Riddle  Jan 16  
Jan 12  Time to Make the Doughnuts  Jan 30  
Jan 26  Stonybrooke River Bridge  Feb 13  
Feb 9  The Growing Snowflake  Feb 27  
Feb 23  Adventure Airlines  Mar 13  
Mar 9  The Suspension Bridge  Mar 27  
Mar 23  Let Me Guess Your Number  Apr 10  
Apr 6  The Indoor Driving Range  Apr 24  
Apr 20  That's a Lot of Rock!  May 8  
May 4  One Area  Many Solutions  May 22  
May 18  Rationals and Irrationals  Jun 5  
Summer  
Jun 1  Building Boxes  Jun 19  
Jun 15  Let's Measure the Earth  Jul 10  
Jun 29  Count Your Seinneps  Jul 17  
Jul 13  Summer Problem 4  Jul 31  
Jul 27  Summer Problem 5  Aug 14  
Aug 10  Summer Problem 6  Aug 28  
* Students can submit to problems any time after they open. However, only solutions submitted before the next problem opens will be considered for inclusion in the posted solutions for the Math Fundamentals, PreAlgebra, Algebra, Geometry, and Trig/Calc problems.