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.
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.
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?
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.
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.
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.
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