Browse Interactives

Constant Area

Do figures with the same area have the same perimeter? Arrange and rearrange 12 square tiles on a grid, and then measure the perimeter of each shape you create.

Discipline: Mathematics
Audience: Student

Constructing Quadrilaterals

Use a "linkage strip" to to build quadrilaterals with different sets of lengths. Once you build a quadrilateral, see if you can deform it into a different quadrilateral with the same side lengths.

Discipline: Mathematics
Audience: Student

Constructing Triangles

Use a "linkage strip" to build triangles with different side lengths. When you build a triangle, see if you can deform it into a different triangle while keeping the side lengths the same.

Discipline: Mathematics
Audience: Student

Continents Over Time

You have two minutes to correctly arrange five images showing the positions of the continents during different geologic periods. Can you do it?

Discipline: Science
Audience: Student

Control a Haber-Bosch Ammonia Plant

Learn about the economics of operating a chemical factory as you try to optimize the process of a simulated Haber-Bosch process ammonia fertilizer plant. Try to maximize profitability by fine-tuning the reaction: adjusting temperature and pressure in the reaction chamber, switching the type of catalyst, and adjusting the rate that the product (ammonia) and impurities are removed.

Discipline: Science
Audience: Student

Control the U.S. Debt!

Neither the president nor Congress appears to be near a solution on how to control the U.S. debt. Use this exercise to show them how to do it.

Discipline: Social Studies and History
Audience: Student

Convergent Boundaries - Colliding Plates

What are convergent boundaries? Examine how collisions of oceanic and continental plates can create volcanoes, island arcs and earthquakes.

Discipline: Science
Audience: Student

Converting English Mass Units

Practice converting mass from one British unit to another. Use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting English Lengths

Practice converting lengths from one British unit to another. Use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting English Volumes

Practice converting volume from one British unit to another. Use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting Fahrenheit to Celsius

Practice converting temperatures from Fahrenheit to Celsius. Feel free to consult the conversion chart and use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting Metric Lengths

Practice converting lengths from one metric unit to another. Use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting Metric Lengths into English Lengths

Practice converting metric lengths into British lengths. Feel free to consult the conversion chart and use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting Metric Mass Units

Practice converting mass from one metric unit to another. Use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting Metric to English Mass

Explore the relationship between the metric and British system. Practice converting metric mass into British mass.

Discipline: Mathematics
Audience: Student

Converting Metric to English Volume

Practice converting metric volume into British volume. Consult the conversion chart and use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Converting Metric Volume

Practice converting volume from one metric unit to another. Use your calculator if you need to.

Discipline: Mathematics
Audience: Student

Counting Raisins

Count the number of raisins in seventeen half-ounce boxes of raisins. Then come up with a solution to determine how many raisins are in Brand X's or Brand Y's box of raisins.

Discipline: Mathematics
Audience: Student

Counting Stairs

Build staircases out of square blocks. Look for patterns and come up with a rule or formula to predict the number of blocks in any staircase.

Discipline: Mathematics
Audience: Student

Creating a Line Plot

Watch as a physical stack of coins is added as a series of dots to a line plot.

Discipline: Mathematics
Audience: Student