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Key Concept is
Mathematics -- Measurement
21 - 25
Many online calculators require a Java-capable browser. Here's one that doesn't, and will perform over 500 different unit conversions for distance, area, volume, mass, speed, temperature, pressure, energy, power, force,...
Problems With a Point
Problems With a Point is a site developed for mathematics students and teachers in grades 6-12. The site contains practice problems on various topics that designed to help students understand mathematical concepts and...
Estimate the Circumference of the Earth using Eratosthenes' Method
This activity, from the Real World Learning Objects Resource Library, helps students estimate the circumference of the earth by recreating "Eratosthenes' amazing experiment utilizing data generated from the...
National Institute of Standards and Technology: Time and Frequency Division
"The Time and Frequency Division, part of NIST's Physics Laboratory, maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad...
A Dictionary of Units of Measurement
This website is great for unit conversions. Americans probably use a greater variety of units of measurement than anyone else in the world. Caught in a slow-moving transition from customary to metric units, we employ a...
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