These activities support student development of number sense and the concept of mathematical operations:
- Primary Resources for Interactive Whiteboards
- Numberline Lane
- Interactive Hundred Board & Calculator for investigating number patterns
- Number Grid:
- Magnetic Numbers can be used with a whiteboard for class presentations and discussions.
- Make It Count: students must use 2-4 of the given numbers and any operations to write an expression equivalent to the target number. This game is similar to the 24 Game and to the Everyday Math game Name That Number.
These activities support student development of the concept of patterns through concrete activities with manipulatives,   The use of variables is developed as a mathematical way of recording the general rule.
- Simple Patterns
- Virtual Manipulative: Function Machine
- Function Machine: Grades 3-4
- Function Machine: Grades 5-6
- Virtual Manipulative: Algebra Balance
- Number Cracker Game
These activities support student development of spatial sense and foster familiarity with the mathematical vocabulary of geometry.
- Building Blocks
- Quadrilateral Quest: Do You Know Their Properties?
- Build a Shape with Tangrams
- Teaching Escher: Using Escher in Classrooms
These activities help students make sense of measurement by measuring the world around them using appropriate units. The emphasis is on constructing meaning for the units as well as the instruments students use to measure length, capacity, etc.
- Interactive Analog/Digital Clock presents clock and the ability to move ahead by minutes, hours, etc. This site would be a great classroom analog/digital clock for use with a large monitor or whiteboard.
- Hickory Dickory Dock: pick the right clock for the given time and the mouse climbs up to get the cheese.
- Billy Bug: feed the bug by moving it to the correct location for the given coordinate pair.
- Billy Bug and His All New Quest for Grub practices graphing coordinate pairs in all four quadrants.
- Hiding Ladybug: Learning Geometry and Measurement Concepts by Creating Paths and Navigating Mazes
- Measure It
- Measuring Lines in centimeters
- Wacky Ruler
- Send in the Trolls
- Sleuths on the Loose
These activities support students as they answer questions about the world around them. Learning to organize and analyze data are important life skills that students will use in both their professional and personal lives.
- Create a Graph
- Data on the Web: where to get statistics for your math lessons
- Landmark Shark Game
- Make your own spinners
- Ken White's Coin Flipping Page
- What Are Your Chances?
- A List of Daily Math Graph and Yes/No Questions
- Graphing Fun: more graph questions
These activities help students develop an appreciation of how discrete math is used to represent and solve problems in real-life situations.
- Clowning Around
- Traffic Jam Activity
- Human Graph Theory where to get statistics for your math lessons
- The Most Colorful Math of All
- A MAP-ematical Dilemma: how many colors do you need to make a map?
- Bobby Bear Counting Strategies
- How Many Squares on a Checkerboard? an organized counting applet
- Venn Diagram Shape Sorter
- Crypto Kids introduces students to codes and cyphers.   Students can learn different ways to make their own secret codes by watching the presentations on this site.
These open-ended problem solving tasks challenge students to apply mathematical concepts and language to everyday problems.   Students also learn to explain their thinking using words, pictures and numbers.   The use of a problem-solving rubric helps students target a best performance by using the prompts found in the rubric.
- Max's Math Adventures
- Math Maven's Mysteries
- Math Fundamentals Problem of the Week
- Aunty Math: Math Challenges for Kids
- AIMS Puzzle Corner
- Figure This: Math Challenges for Families
- Mathematical Challenges
- Ole Miss Problems of the Week
- Math League Sample Problems
- TIMSS Mathematics Questions for 4th and 8th grades
- Math Counts Problem of the Week
- Exemplars Problems
- Harvard Balanced Assessment Project
- Classroom Task Bank: Mathematics
- Interactive Math Activities from the Center School District
- Sample math WASL questions: for grades K-12
- Math Performance Tasks from the Arlington Central School District
- Web School: Math Inventory
These links challenge students to develop logical thinking and use patterns to solve these puzzles and brain teasers.
- Daily Sudoku for Kids
- Add 'em Up Game
- All Out Game
- Place It: Recreate the Square from the pieces
- Erich's Puzzle Palace
- Master Mind Game
- Mastermind Game applet
- Simon Says Game
- Peg Game
- The Set Game Daily Puzzle
- Math Gym Arcade