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  Saul's Cupcakes  
Mar 7  Snack Time!  
Mar 21  A Trip to the Ballpark  
Apr 4  Pocket Money  
Apr 18  Making Cookies  
May 2  Recycling  
May 16  Saving Up  
Summer  
May 30  Ants on a Bun  
Jun 13  Bubblegum  
Jun 27  Counting Cars  
Jul 11  Summer Problem 4  
Jul 25  Summer Problem 5  
Aug 8  Summer Problem 6  
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  California Dreaming  Mar 18  
Mar 14  Alien Operations  Apr 1  
Mar 28  Choosy Chooser's Choices  Apr 15  
Apr 11  LawnMowing Chore  Apr 29  
Apr 25  Birds in Trees  May 13  
May 9  Lost in Space  May 27  
May 23  Can You Drink That Swimming Pool?  Jun 10  
Summer  
Jun 6  Campfire Camaraderie  Jun 24  
Jun 20  A Larger Garden  Jul 8  
Jul 4  Summer Problem 3  Jul 22  
Jul 18  Summer Problem 4  Aug 5  
Aug 1  Summer Problem 5  Aug 19  
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  Shortcut Savings  Mar 11  
Mar 7  Boxes of Stationery  Mar 25  
Mar 21  Ostrich Llama Count  Apr 8  
Apr 4  Kaytee's Contest  Apr 22  
Apr 18  Accounting for Age  May 6  
May 2  Divisible by a Dozen  May 20  
May 16  Suli's Sense  Jun 3  
Summer  
May 30  Lemonade Fun  Jun 17  
Jun 13  Counting Chicken Wings  Jul 1  
Jun 27  Train Travel  Jul 15  
Jul 11  Summer Problem 4  Jul 29  
Jul 25  Summer Problem 5  Aug 12  
Aug 8  Summer Problem 6  Aug 26  
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  Swapping Marbles  Mar 18  
Mar 14  Polynomial Power  Apr 1  
Mar 28  Fraction Debate  Apr 15  
Apr 11  The Bouncing Ball  Apr 29  
Apr 25  Field Trip  May 13  
May 9  The ABCs of Exponents  May 27  
May 23  Factor Bingo  Jun 10  
Summer  
Jun 6  The Joke  Jun 24  
Jun 20  Marathon Mitch  Jul 8  
Jul 4  Summer Problem 3  Jul 22  
Jul 18  Summer Problem 4  Aug 5  
Aug 1  Summer Problem 5  Aug 19  
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  Pondering Pantographs  Mar 11  
Mar 7  Fix This Picture  Mar 25  
Mar 21  Exploding Shapes  Apr 8  
Apr 4  Flying High  Apr 22  
Apr 18  Save the Lake!  May 6  
May 2  As Far as the Eye Can See  May 20  
May 16  Why Does This Construction Work?  Jun 3  
Summer  
May 30  Voulez Vous des Voissoirs?  Jun 17  
Jun 13  The Perimeter of an Octagon  Jul 1  
Jun 27  Where's Juanita Walking?  Jul 15  
Jul 11  Summer Problem 4  Jul 29  
Jul 25  Summer Problem 5  Aug 12  
Aug 8  Summer Problem 6  Aug 26  
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  Don't Be Late for Dinner  Mar 18  
Mar 14  Basketball Angles  Apr 1  
Mar 28  Doughnut Dilemma  Apr 15  
Apr 11  Fishing on the Bay  Apr 29  
Apr 25  Around the Corner  May 13  
May 9  Job Interview at the CanCan Company  May 27  
May 23  Your Interview Question Is...  Jun 10  
Summer  
Jun 6  Let’s Measure the Earth  Jun 24  
Jun 20  Shipping Packages  Jul 8  
Jul 4  Summer Problem 3  Jul 22  
Jul 18  Summer Problem 4  Aug 5  
Aug 1  Summer Problem 5  Aug 19  
* 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.