Khan Academy
Khan Academy: Pythagorean Theorem Challenge
In this exercise, students practice using the Pythagorean Theorem in word problems. Students receive immediate feedback and have the opportunity to watch a video, get hints, or try questions repeatedly.
Maths Challenge
Maths challenge.net: Problem Solving Database
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...
Khan Academy
Khan Academy: Whole Number Place Value Challenge
Practice problems to challenge your understanding of whole number place value Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Other
Problems in the Points Contest of Ko Mal
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.
CK-12 Foundation
Ck 12: Elem Math: Total Length Challenge Problems (Grade 4)
[Free Registration/Login may be required to access all resource tools.] A practice quiz where students must solve multi-step problems about elapsed length and distance.
Khan Academy
Khan Academy: Area Challenge
Practice solving problems involving triangles, parallelograms, and composite figures. Exercises include decimals, fractions, and word problems. Area of circles is not included. Students receive immediate feedback and have the opportunity...
Fundación Cientec
Cientec: Juegos Cooperativos
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.
National Council of Teachers of Mathematics
Nctm: Figure This: Math Challenges for Families
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...
National Council of Teachers of Mathematics
Nctm: Thats Interesting
Read this word problem and solve the questions that follow. An extra challenge and an answer check are also provided.
Khan Academy
Khan Academy: Scientific Notation Challenge
Practice solving more challenging problems involving scientific notation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Khan Academy
Khan Academy: Pythagorean Theorem Challenge
Solve real-world problems that can be modeled by right triangles, using the Pythagorean Theorem!
CK-12 Foundation
Ck 12: Trigonometry Word Problems
[Free Registration/Login Required] Students will determine the angle of depression using a diagram with a helicopter. Click learn more to watch a video and click challenge me to answer a practice question.
PBS
Pbs: Modeling Fraction Multiplication With Equal Groups
This video presents a visual model for solving a word problem involving the multiplication of fractions. The problem asks students to use the amount of bamboo that a panda eats in an hour to determine how much he eats in a quarter of an...
Khan Academy
Khan Academy: Square and Cube Challenge
Practice solving problems using your knowledge of square and cube roots. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
National Council of Teachers of Mathematics
The Math Forum: Famous Problems in the History of Mathematics
On this site, there are several math problems to explore and solve. Look through some solutions by famous mathematicians and expand your thinking about some interesting math concepts. Teachers of elementary grades may want to use this...
Scholastic
Scholastic: Max's Math Adventures: Good Bye Training Wheels!
Take a bike ride with Max and add up the miles he has traveled. Use the teacher's guide, activity sheet, and extra challenges to create an engaging learning experience!
Scholastic
Scholastic: Max's Math Adventures: Farmer Fred's Counting Farm
Add and rhyme with Farmer Fred, then use the activity sheet to work through some more farm addition. The teacher's guide and extra challenges will be helpful in lesson planning.
National Council of Teachers of Mathematics
The Math Forum: Math World Interactive
MathWorld Interactive "Is a FREE project where students in grades 6 to 8 from around the world work on open-ended problems." Go to the Frequently Asked Questions section for an easy introduction.
Scholastic
Scholastic: Max's Math Adventures: Subtraction Square Dance
This site has a square dance rhyme with some fun subtraction practice. Teachers will appreciate the activity page, the extra challenges, and the teacher's guide for easy lesson planning.
University of Cambridge
University of Cambridge: Nrich: Put Out the Flags
Sharpen your logic and percent skills while working on this challenge. A strategy for solving the problem and the solution are available from links on the left.
University of Cambridge
University of Cambridge: Maths and Sports: The Olympic Torch Tour
Can you find the best route for the Olympic Torch relay to take? This more challenging activity is designed to be accessible to GCSE maths students (grades 8, 9, and 10).
Fun Brain
Fun Brain: Power Football (Decimal Game)
Four levels of play, from easy to super brain, challenge students to add, subtract, multiply, and divide decimals. Get three correct answers in a row and score a field goal.
ClassFlow
Class Flow: Strategies to Meet Challenges
[Free Registration/Login Required] Challenge is another word for problem solving. In this flipchart students are given the four strategies for problem solving: Explore, plan, solve and reflect.
University of Cambridge
University of Cambridge: Nrich: Scoring With Dice
On this one page website sharpen your logic, multiplication, and multiples skills while working on this challenge. The solution is available to double check your solution.