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Activity
National Council of Teachers of Mathematics

The Math Forum: K 12 Math Puzzles

For Students K - 1st
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...
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Activity
Other

Mycoted: Lateral Thinking Puzzles

For Students 9th - 10th
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...
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Activity
Maths Challenge

Maths challenge.net: Circular Pipes

For Students 9th - 10th Standards
A realistic world problem using the knowledge of chords and the parts of a circle to solve. Test your knowledge on this brain teaser!
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Activity
National Council of Teachers of Mathematics

Nctm: Figure This: Math Challenges for Families

For Students 2nd - 8th
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...
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Website
Scholastic

Scholastic: I Spy

For Students Pre-K - 1st Standards
These interactive matching games for elementary age students combine visuals of familiar objects and rhyming riddles to create brain-teasing puzzles.
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Activity
Scholastic

Scholastic: Math Maven's Mysteries: The Cuckoo Caper

For Students 3rd - 8th
The famous Clockenheimer Cuckoo is missing from Clockenheimer Clocks on Main Street! Help Math Maven get it back by solving a math riddle.
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Interactive
University of Cambridge

University of Cambridge: Nrich: Got It

For Students 1st - 8th
Sharpen your logical thinking and see if you can figure out the strategy to get to the target number before the computer.
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Activity
National Council of Teachers of Mathematics

Nctm: Figure This: Math Challenges for Families

For Students 9th - 10th
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...
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Unit Plan
TED Talks

Ted: Ted Ed: Should I Stay or Should I Switch Doors?

For Students 9th - 10th
The Monty Hall Problem is a brain teaser based on the popular game show, Let's Make a Deal. The folks at Numberphile explore the famous problem which posits if a contestant should switch doors in order to find the car amongst the goats....
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Activity
PBS

Pbs: Buoyancy Basics

For Students 3rd - 8th
NOVA explores the basic principle of buoyancy. Also included at this site are some interesting brain-teasers related to the topic.
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Handout
Other

Wordsmyth: The Educational Dictionary Thesaurus

For Students 1st - 9th Standards
This site not only is a dictionary and a thesaurus, but it also has brain teasers and games.
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Interactive
Fundación Cientec

Cientec: Juegos Cooperativos

For Students 3rd - 8th
A small collection of 20 or so math brain teasers and word problems, in Spanish. Challenging for younger students -- they use math skills up to multiplication.
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Interactive
PBS

Pbs Learning Media: Equivalent Halves: Cyberchase Games

For Students K - 1st
Find thirteen ways to show one half by solving this brain teaser from Cyberchase.
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Activity
National Council of Teachers of Mathematics

The Math Forum: Beat the Calculator!

For Students 3rd - 8th
Find more than 500 "mental calculation tricks" that will help you square numbers, add, multiply divide, subtract, and find percentages. A great resource for advance math students, gifted children, and teachers wanting to find ideas for...
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Activity
TES Global

Tes: Printed Quiz on 11: Plus Verbal Reasoning Hidden Word

For Students 1st - 6th
[Free Registration/Login Required] This site provides several word puzzles for students. When given sets of phrases, students will find four-letter words hidden within each set.
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Handout
Amby Duncan-Carr

Amby: Test Taking Skills

For Students 9th - 10th
Are you looking to increase your test scores? Investigate the Amby site to explore a variety of resources to help you excel at test taking.
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Website
Maths Challenge

Maths challenge.net: Problem Solving Database

For Teachers 9th - 10th Standards
Need some challenging problem-solving work for your students in the following areas: Discrete, Geometry, Numbers, and Code Breaking? This is the place for an enormous database of problems aimed at high school age students. They are...
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Unit Plan
TED Talks

Ted: Ted Ed: Can You Solve the Three Gods Riddle?

For Students 9th - 10th
You and your team have crash-landed on an ancient planet. Can you appease the three alien overlords who rule it and get your team safely home? Created by logician Raymond Smullyan, and popularized by his colleague George Boolos, this...
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Unit Plan
TED Talks

Ted: Ted Ed: Can You Solve the Counterfeit Coin Riddle?

For Students 9th - 10th
You're the realm's greatest mathematician, but ever since you criticized the Emperor's tax laws, you've been locked in the dungeon. Luckily for you, one of the Emperor's governors has been convicted of paying his taxes with a counterfeit...
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Unit Plan
TED Talks

Ted: Ted Ed: How High Can You Count on Your Fingers? Spoiler:much Higher Than 10

For Students 9th - 10th
How high can you count on your fingers? It seems like a question with an obvious answer. After all, most of us have ten fingers- or to be more precise, eight fingers and two thumbs. This gives us a total of ten digits on our two hands,...
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Unit Plan
TED Talks

Ted: Ted Ed: Can You Solve the Airplane Riddle?

For Students 9th - 10th
Professor Fukano, the famous scientist, has embarked on a new challenge - piloting around the world in a plane of his own design. There's just one problem: there's not enough fuel to complete the journey. Luckily, there are two other...
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Unit Plan
TED Talks

Ted: Ted Ed: Can You Solve the River Crossing Riddle?

For Students 9th - 10th
As a wildfire rages through the grasslands, three lions and three wildebeest flee for their lives. To escape the inferno, they must cross over to the left bank of a crocodile-infested river. Can you help them figure out how to get across...
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Unit Plan
TED Talks

Ted: Ted Ed: Can You Solve the Prisoner Boxes Riddle?

For Students 9th - 10th
Your favorite band is great at playing music but not so great at being organized. They keep misplacing their instrucments on tour.
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Unit Plan
TED Talks

Ted: Ted Ed: Can You Solve the Passcode Riddle?

For Students 9th - 10th
In a dystopian world, your resistance group is humanity's last hope. Unfortunately, you've all been captured by the tyrannical rulers and brought to the ancient coliseum for their deadly entertainment. Will you be able to solve the...

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