Don’t let your kids grow up thinking that “math” means workbook pages! Wise parents make time to pay with math.

Ambleweb Function Machine: Choose the type of problem you want to guess, or go random for more challenge. My math club kids love function machines.

Aunty Math: Math Challenges for K–5 Learners: Story problem challenges, tips on problem solving, and advice for the parent or teacher.

Bedtime Math: A daily math problem (with answers) at three levels of difficulty, approximately preschool to upper-elementary level.

DragonBox Algebra: A playful math app that uses puzzles to teach the basic principles of solving simple (linear) equations. See also DragonBox Elements for geometry.

Egyptian Math: Could you survive in the world of Egyptian numerals and mathematics?

Eratosthenes’ Sieve: Click on any number, and all of its multiples (except the number itself) will disappear from the chart.

Fibonacci Numbers and Nature: Find out all about his famous rabbits, and about honeybees, seashells, pinecones, and more.

Hands-On Equations: These apps take a step-by-step approach to solving simple (linear) algebra equations.

Head Hunters Game: A bloody fun game for the Viking in all of us. If you enjoy that one, try the other math tricks and games at Murderous Maths.

Introduction to Probability: A short tutorial with interactive questions from Mrs. Glosser’s Math Goodies. See also: Rolling a Pair of Dice, Conditional Probability, and the Challenge Exercises. And check out Combining Probabilities: When more than one thing is happening in a probability problem, how do you know whether to add the probabilities or multiply them? And what happens if the events are not mutually exclusive?

Logic-Grid Brain Teasers: I love logic grid problems, and Braingle offers thirty-four pages of them. Have fun. See also: Math Brain Teasers.

Math Cats: Math explorations, crafts, homemade manipulatives, and lots of fun.

Math Playground: My favorite site for a variety of math games that make students think—not just number drill.

Math Wire: Activities and games for elementary students by Terry Kawas. Check out the Hundred Chart Logic Puzzles.

MegaPenny Project: How many does it take to pile up a ton of pennies?

Multiplication, An Adventure in Number Sense: Explore the multiplication table and discover some interesting things about how numbers work.

Multiplication Models: How many different ways can you think of to look at multiplication?

Professor Pig’s Magic Math: Cartoons, hands-on games, and mental math practice‌—‌these pdf lessons are excellent to help young students understand numbers, not just memorize facts.

Scratch: A programming language that makes it easy for students to create interactive stories, animations, games, music, and art. To get started, check out their collection of video tutorials.

Suzanne’s Math Lessons: Activities and projects for upper-elementary and middle school, collected by Suzanne Alejandre.

Taxicab Treasure Hunt: A game based on the non-Euclidean geometry of city streets.

Thinking Blocks: Learn to solve word problems by modeling them with interactive virtual blocks. A visual approach to thinking things through.

ThinkQuest History of Mathematics: Brief overview of math history, with biographies of influential mathematicians and short online quizzes.

Who Was Fibonacci?: “A brief biographical sketch of Fibonacci, his life, times and mathematical achievements.”

Wuzzit Trouble: A fun and challenging app that combines an adventure game with mathematical thinking skills, produced by Stanford mathematician Keith Devlin and friends.

Feature photo above by Fractal Ken via Flickr (CC BY 2.0). For more resource suggestions, check out my Math with Living Books pages.

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