201516 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 201415 academic year.
[ Primary  Math Fundamentals  PreAlgebra  Algebra  Geometry  Trig/Calc ]
Primary  
Submissions Open 
Problem  Mentor Group 

Summer  
Jun 8  How Many Berries Did I Eat?  
Jun 22  Pizza Night  
Jul 6  The Eagle and the Bear  
Jul 20  Clowning Around  
Aug 3  Charlie's Gumballs  
201516 Problems  
Aug 17  A Game of Dice  
Aug 31  Playing Cards  
Sep 14  Problem 3  
Sep 28  Problem 4  
Oct 12  Problem 5  
Oct 26  Problem 6  
Nov 9  Problem 7  
Nov 23  Problem 8  
Dec 7  Problem 9  
Dec 28  Problem 10  
Jan 11  Problem 11  
Jan 25  Problem 12  
Feb 8  Problem 13  
Feb 22  Problem 14  
Mar 8  Problem 15  
Mar 22  Problem 16  
Apr 5  Problem 17  
Apr 19  Problem 18  
May 3  Problem 19  
May 17  Problem 20  
Math Fundamentals  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Summer  
Jun 1  Rugby Rules!  Jun 19  
Jun 15  The Kickball Tournament  Jul 10  
Jun 29  Eating Grapes  Jul 17  
Jul 13  Jumping Rope  Jul 31  
Jul 27  Frog Farming  Aug 14  
Aug 10  Cupcakes, Cupcakes!  Aug 28  
201516 Problems  
Aug 24  Sharing Birthdays  Sep 11  
Sep 7  Problem 2  Sep 25  
Sep 21  Problem 3  Oct 9  
Oct 5  Problem 4  Oct 23  
Oct 19  Problem 5  Nov 6  
Nov 2  Problem 6  Nov 20  
Nov 16  Problem 7  Dec 4  
Nov 30  Problem 8  Dec 18  
Dec 14  Problem 9  Jan 8  
Jan 4  Problem 10  Jan 22  
Jan 18  Problem 11  Feb 5  
Feb 1  Problem 12  Feb 19  
Feb 15  Problem 13  Mar 4  
Feb 29  Problem 14  Mar 18  
Mar 14  Problem 15  Apr 1  
Mar 28  Problem 16  Apr 15  
Apr 11  Problem 17  Apr 29  
Apr 25  Problem 18  May 13  
May 9  Problem 19  May 27  
May 23  Problem 20  Jun 10  
PreAlgebra  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Summer  
Jun 8  Get Your Kicks on Route 66  Jun 26  
Jun 22  Timber!  Jul 10  
Jul 6  Sizing Up Sequoias  Jul 24  
Jul 20  Power Outage  Aug 7  
Aug 3  Measuring Melons  Aug 21  
201516 Problems  
Aug 17  At Least a Mile  Sep 4  
Aug 31  Cork Costs  Sep 18  
Sep 14  Problem 3  Oct 2  
Sep 28  Problem 4  Oct 16  
Oct 12  Problem 5  Oct 30  
Oct 26  Problem 6  Nov 13  
Nov 9  Problem 7  Nov 27  
Nov 23  Problem 8  Dec 11  
Dec 7  Problem 9  Jan 1  
Dec 28  Problem 10  Jan 15  
Jan 11  Problem 11  Jan 29  
Jan 25  Problem 12  Feb 12  
Feb 8  Problem 13  Feb 26  
Feb 22  Problem 14  Mar 12  
Mar 8  Problem 15  Mar 26  
Mar 22  Problem 16  Apr 9  
Apr 5  Problem 17  Apr 23  
Apr 19  Problem 18  May 7  
May 3  Problem 19  May 21  
May 17  Problem 20  Jun 4  
Algebra  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Summer  
Jun 1  Time Trial Triumphs  Jun 19  
Jun 15  Triangle Probability  Jul 10  
Jun 29  Jimmy's Hits  Jul 17  
Jul 13  Two for Two More  Jul 31  
Jul 27  The Box Supper  Aug 14  
Aug 10  Many or Money?  Aug 28  
201516 Problems  
Aug 24  Operation Warm Up  Sep 11  
Sep 7  Problem 2  Sep 25  
Sep 21  Problem 3  Oct 9  
Oct 5  Problem 4  Oct 23  
Oct 19  Problem 5  Nov 6  
Nov 2  Problem 6  Nov 20  
Nov 16  Problem 7  Dec 4  
Nov 30  Problem 8  Dec 18  
Dec 14  Problem 9  Jan 8  
Jan 4  Problem 10  Jan 22  
Jan 18  Problem 11  Feb 5  
Feb 1  Problem 12  Feb 19  
Feb 15  Problem 13  Mar 4  
Feb 29  Problem 14  Mar 18  
Mar 14  Problem 15  Apr 1  
Mar 28  Problem 16  Apr 15  
Apr 11  Problem 17  Apr 29  
Apr 25  Problem 18  May 13  
May 9  Problem 19  May 27  
May 23  Problem 20  Jun 10  
Geometry  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

Summer  
Jun 8  Dendrochronology  Jun 26  
Jun 22  Seeing Stars  Jul 10  
Jul 6  Snail's Trail  Jul 24  
Jul 20  Well, Well, Well  Aug 7  
Aug 3  Two Rectangles  Aug 21  
201516 Problems  
Aug 17  Integer Triangle Angles  Sep 4  
Aug 31  Congruent Rectangles Help  Sep 18  
Sep 14  Problem 3  Oct 2  
Sep 28  Problem 4  Oct 16  
Oct 12  Problem 5  Oct 30  
Oct 26  Problem 6  Nov 13  
Nov 9  Problem 7  Nov 27  
Nov 23  Problem 8  Dec 11  
Dec 7  Problem 9  Jan 1  
Dec 28  Problem 10  Jan 15  
Jan 11  Problem 11  Jan 29  
Jan 25  Problem 12  Feb 12  
Feb 8  Problem 13  Feb 26  
Feb 22  Problem 14  Mar 12  
Mar 8  Problem 15  Mar 26  
Mar 22  Problem 16  Apr 9  
Apr 5  Problem 17  Apr 23  
Apr 19  Problem 18  May 7  
May 3  Problem 19  May 21  
May 17  Problem 20  Jun 4  
Trig/Calc  
Submissions Open 
Problem  Mentor Group 
Solutions Posted 

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  The General Box Company  Jul 31  
Jul 27  Cooling Colas  Aug 14  
Aug 10  Basketball Angles  Aug 28  
201516 Problems  
Aug 24  Building Boxes  Sep 11  
Sep 7  Problem 2  Sep 25  
Sep 21  Problem 3  Oct 9  
Oct 5  Problem 4  Oct 23  
Oct 19  Problem 5  Nov 6  
Nov 2  Problem 6  Nov 20  
Nov 16  Problem 7  Dec 4  
Nov 30  Problem 8  Dec 18  
Dec 14  Problem 9  Jan 8  
Jan 4  Problem 10  Jan 22  
Jan 18  Problem 11  Feb 5  
Feb 1  Problem 12  Feb 19  
Feb 15  Problem 13  Mar 4  
Feb 29  Problem 14  Mar 18  
Mar 14  Problem 15  Apr 1  
Mar 28  Problem 16  Apr 15  
Apr 11  Problem 17  Apr 29  
Apr 25  Problem 18  May 13  
May 9  Problem 19  May 27  
May 23  Problem 20  Jun 10  
* 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.