A collection of Math brain teasers.

Check out the variety of probability brain teasers at this site, which you can sort by popularity and difficulty.

Check out the variety of math brain teasers at this site, which you can sort by popularity and difficulty.

Test your critical thinking skills with a variety of cryptography brain teasers, phrases or expressions "encoded in some way." Solve the teasers provided at this site, and submit your own for others to try!

Think logically as your solve the brain teasers provided on this page. Test your own logic skills with the puzzles that you can sort by popularity and difficulty, and test others' logic skills by submitting your own puzzles.

Discovery School offers a terrific "categorized archive of challenging Brain Boosters." Choose from hundreds of engaging activities pertaining to Categorization, Lateral Thinking, Reasoning, Logic, Word and Letter Play, Spatial...

Check out the variety of optical illusions provided at this site. Fool your eyes with "Chair or Block," "Angles or E," "Old or Young Woman," "Face or Vase," and others.

Features great games to wake up the brain. Test your knowledge of words, numbers, vocabulary, and more while having fun.

Educational publisher Houghton Mifflin provides a colorful, engaging site that offers test-prep practice, test-taking strategies, and brain teasers on a variety of math concepts for grades 1-6. Just "Choose an activity and pick a grade,"...

Educational publisher Houghton Mifflin provides a colorful, engaging site that offers test-prep practice, test-taking strategies, and brain teasers on a variety of math concepts for grades 1-6. Just "Choose an activity and pick a grade,"...

Use these twelve printable brain teasers with your math lessons. Each one is illustrated and provides directions to assist you in finding the answer.

The resource consists of math challenges that use problem-solving skills. Students can check their answers and look at past problems.

Read stories and solve mysteries based on clues provided. Also, submit your own mysteries for other visitors to this site to solve.

The letter equations at this site test your critical thinking skills as well as your knowledge of facts dealing with a variety of subjects: geography, music, history and more.

Learn about the annual KoMal competition in mathematics, physics, and information technology, and challenge your ability to solve problems involving advanced algebra, logic, and other related topics through the tests provided at this site.

Fantastic classic children's stories online that you can listen to while you read along. Stories are offered in streaming or downloadable MP3 format. Some of the popular stories are: "The Tale of Peter Rabbit", "The Tale of the Flopsy...

This site from the Math Forum of Drexel University provides a selection of math puzzles for grades K through 12 are found here. Types include: taking the numbers in the year 2004 and arriving at the numbers 1 through 100, using four 4s...

A storehouse of puzzles designed to train the brain to think in atypical ways. Find riddles, visual puzzles, analogies, math problems, and more. Excellent source of raw material for practicing original and creative thinking one puzzle at...

A realistic world problem using the knowledge of chords and the parts of a circle to solve. Test your knowledge on this brain teaser!

Students, teachers, and parents alike will enjoy this challenging math site. It contains a clever brain teaser section plus creative problems related to algebra, geometry, measurement, numbers, statistics, and probability. A Spanish...

These interactive matching games for elementary age students combine visuals of familiar objects and rhyming riddles to create brain-teasing puzzles.

The famous Clockenheimer Cuckoo is missing from Clockenheimer Clocks on Main Street! Help Math Maven get it back by solving a math riddle.

Sharpen your logical thinking and see if you can figure out the strategy to get to the target number before the computer.

NCTM offers sections on Families & School, Families & Math, Families & Homework, and more. Has links to brain-teaser problems ranging in skill from very easy to challenging. Click Take a Challenge or Challenge Index for...