Current Problems of the Week
Algebra
Kristina's Code
 September 15
Latest Solution: Calendar Calculations
Use the four equations that Kristina wrote to figure out her two unknown numbers. 

Math FundamentalsLatest Solution: Mr. Lincoln's Line 
Geometry
Lost at Sea?
 September 8
Latest Solution: Fitting In
Use three bearings to determine whether a boat is in the United States or Canada. Preview: Pentagon Puzzle 
PreAlgebra
Forming Triangles from a Folding Ruler
 September 8
Latest Solution: Boxes of Stationery
Describe the three triangles that can be made. Preview: Women's Walkway 
Trig & Calculus
Is It a Midpoint?
 September 15
Latest Solution: Find the Function
Can you prove that what's happening in this picture will always happen with any cubic function? 