Students design, build and test model race cars made from simple materials (lifesaver-shaped candies, plastic drinking straws, Popsicle sticks, index cards, tape) as a way to explore independent, dependent and control variables. They measure the changes in distance travelled with the addition of mass to the vehicles. Students also practice the steps of the engineering design process by brainstorming, planning, building, testing, and improving their "mint-mobiles."

This short video and interactive assessment activity is designed to teach fourth graders about mixed adding and subtracting of capacities (english units).

This short video and interactive assessment activity is designed to give fourth graders an overview of capacity with compound units - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about mixed operations with compound units using multiplication and division - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about using scales and calculations to find weights (metric units).

This short video and interactive assessment activity is designed to teach fourth graders about multi-step compound unit addition (metric units) - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about multi-step division problems with compound units.

This short video and interactive assessment activity is designed to teach fourth graders about multi-step problems using the four operations - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about multiplication and division metric capacity - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about multiplication and division of compound units with pictures - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about multiplication and division of lengths.

This short video and interactive assessment activity is designed to teach fourth graders about multiplying and dividing (english units).

This short video and interactive assessment activity is designed to teach fourth graders about solving multi-step problems with multiplication and division (metric units) - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about multiplying lengths (english units).

This short video and interactive assessment activity is designed to teach fourth graders about multiplying weights (metric units).

Use this site to learn about basic gas properties including motion, viscosity, and compressibility. Includes links to activities for all ages.

This video shows how the center of gravity on an airplane is determined, where it is located, and why it's important for maintaining balance. Watch as computers on the aircraft redistribute weight of fuel on an airplane to help maintain balance. [14:10]

This interactive game has students apply skills in estimation, measurement, and basic addition using pearls. Students are asked to estimate the number of pearls in a treasure chest by making predictions and using number sense. The skills are appropriate for students in grades th3-5. Additional features include links to related history, lesson plans, and articles on pearls. CCSS.Math.Content.3.MD.A.2 Measure and estimate liquid volumes and masses of objects using standard units

Oscar uses a pan balance to compare weights, and explains what you should do if you come across a Saffron Slimer.

This short video and interactive assessment activity is designed to teach fourth graders about one-step subtraction conversions with compound units (metric units) - word problems.