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 

Aug 17  A Game of Dice  
Aug 31  Playing Cards  
Sep 14  At the Fair  
Sep 28  Color Competition  
Oct 12  Making Sandwiches  
Oct 26  Building a Fence  
Nov 9  Pretzel Riddle  
Nov 23  At the Grocery Store  
Dec 7  Getting Allowance  
Dec 28  Laying Carpet  
Jan 11  Prize Box  
Jan 25  Puppies for Sale  
Feb 8  Letter to Grandma  
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 

Aug 24  Sharing Birthdays  Sep 11  
Sep 7  Chime Time  Sep 25  
Sep 21  Sports Weigh In  Oct 9  
Oct 5  A Pound of Tea  Oct 23  
Oct 19  Apple Inventory  Nov 6  
Nov 2  Subway Tokens  Nov 20  
Nov 16  Trapezoid Teatime  Dec 4  
Nov 30  Zoo Train  Dec 18  
Dec 14  Four Playful Mathematicians  Jan 8  
Jan 4  Fish in a Barrel  Jan 22  
Jan 18  Assembly Seating  Feb 5  
Feb 1  Nuts in a Bowl  Feb 19  
Feb 15  Pauline the Plumber  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 

Aug 17  At Least a Mile  Sep 4  
Aug 31  Cork Costs  Sep 18  
Sep 14  Buying Cola  Oct 2  
Sep 28  Downloading Duel  Oct 16  
Oct 12  Apple Picking  Oct 30  
Oct 26  Pumpkin Carving for Charity  Nov 13  
Nov 9  Peeling Potatoes  Nov 27  
Nov 23  A Cranberry Craving  Dec 11  
Dec 7  Eight Squares on a Table  Jan 1  
Dec 28  A Snowy Driveway  Jan 15  
Jan 11  Which Coupon is Better?  Jan 29  
Jan 25  Anjelica's Very Odd Magic Sweater  Feb 12  
Feb 8  Gearing Up  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 

Aug 24  Operation Warm Up  Sep 11  
Sep 7  Filling Glasses  Sep 25  
Sep 21  Eating Contest  Oct 9  
Oct 5  Sierpinski Stages  Oct 23  
Oct 19  To Be or Not to B  Nov 6  
Nov 2  Voter Turnout  Nov 20  
Nov 16  A Championship Season  Dec 4  
Nov 30  How Many Ties?  Dec 18  
Dec 14  Two by Canoe  Jan 8  
Jan 4  A Slippery Slope  Jan 22  
Jan 18  Symbol Logic  Feb 5  
Feb 1  Pressed for Time  Feb 19  
Feb 15  A Phoney Deal?  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 

Aug 17  Integer Triangle Angles  Sep 4  
Aug 31  Congruent Rectangles Help  Sep 18  
Sep 14  Finding a Supplement  Oct 2  
Sep 28  All Around the World  Oct 16  
Oct 12  Boxing Up Harry's Broom  Oct 30  
Oct 26  Eight Sticks Zero Triangles  Nov 13  
Nov 9  Analyzing Angles  Nov 27  
Nov 23  Lotsa Popcorn!  Dec 11  
Dec 7  Nautical Navigation  Jan 1  
Dec 28  The Coordinated Quadrilateral  Jan 15  
Jan 11  Building a Regular Hexagon  Jan 29  
Jan 25  Measuring Cylinders  Feb 12  
Feb 8  Regional Ratios  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 

Aug 24  Building Boxes  Sep 11  
Sep 7  Goose Bay Mountain  Sep 25  
Sep 21  Costly Cable  Oct 9  
Oct 5  Count Your Seinneps  Oct 23  
Oct 19  World Series Champions  Nov 6  
Nov 2  Environmentally Friendly  Nov 20  
Nov 16  Let's Measure the Earth  Dec 4  
Nov 30  Count to Ten?  Dec 18  
Dec 14  Building Bridges  Jan 8  
Jan 4  The General Box Company  Jan 22  
Jan 18  Cooling Colas  Feb 5  
Feb 1  Cutting the Cookie  Feb 19  
Feb 15  A Deviation from the Average  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.