In a series of practice problems, learners use the substitution method to solve systems of linear equations, also called "simultaneous linear equations."

In this animated activity, learners explore three major methods of heat transfer and practice identifying each.

In part 2 of this series, learners follow the steps of the “mathemagician” to examine these numerical curiosities: The 189 Challenge; An Armstrong Number: What’s Special About 153? Is 495 Different or Indifferent? Is 6174 Different or Indifferent? It is always 618, and Beginning and Ending the Same.

In this animated activity, learners read about the properties of a rectangle and its components. They then work practice problems to find the perimeter and area of rectangles.

In this animated and interactive object, learners view American National Standard and International Standard sheet sizes. A quiz completes the activity.

In this learning activity you'll read descriptions of military standards, ANSI, ISO, calibration system standards and audit system reference standards. These topics would be important for the CQT (certified quality technician).

Giving gifts is an important part of conducting business around the world. Learners read about the kinds of gifts that are welcomed in various cultures, and which are not. A quiz completes the activity.

In this animated and interactive object, learners view American National Standard and International Standard sheet sizes. A quiz completes the activity.

In this learning activity you'll calculate exchange rates to determine the impact of prices of exports and imports.

You'll be able to identify the precision of an approximate number in measurement.

DRM 2 MACROECONOMICS

You'll practice converting between units of measure for time.

Learn how to tell time in Haitian Creole