In this interactive object, learners examine the properties of equality and use those properties to solve simple equations.
International Time Zones (Screencast)
By Virginia Kirsch
In this screencast, you will learn about the 24 time zones.
By Allen Reed, Douglas Jensen
In this interactive object, learners study the properties of a trapezoid and use a geometric formula to find its perimeter and area.
Simplifying Algebraic Fractions that Contain No Addition or Subtraction
By Jim Cihak
In this highly interactive and animated object, learners follow a step-by-step process to reduce algebraic fractions, which contain no addition or subtraction, to their simplest, most elementary form. Immediate feedback is provided. This activity has audio content.
Learners study the properties of a cube and use geometric formulas to find volume and surface area.
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