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Links to other challenge problem pages:

NCTM Challenge Problems

Math problems and puzzles

Logic and math problems

Brain Storm

Interactive Mathematics Education and Puzzles

TEN SOLUTIONS

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Average Rate

Cryptorithms

Inaccessible Angle

Painted Sides of a Cube

Pie Slices

Plug

Segment of Circle

Semi vs. Quarter Circle

Sum of First n integers

Tangent Lines - Internal and External

Write-ups

A. Unsolved Problem

Four 'Dawgs'

B. Position Paper

OTHER PROBLEMS

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Flower Bed

Gazebo

Island Treasure

Which is Largest?

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