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MathChallenges is a collection of widely varied math puzzles and logic problems created by Theoni Pappas (author of The Mathematics Calendar) and Dale LindleyA new Challenge is presented every day. Some Challenges require logical reasoning, others a knowledge of high school level mathematics. All require careful thinking!Each challenge consists of three parts: A statement of the Challenge. Need some help? Press the Hint button. If you think you have the right solution, tap the Solution button. Here you will find a step-by-step description of one or more ways to solve the challenge.At any time you can revisit Challenges from past days by touching the to the past button.