Sophia Learning
Sophia: Percent Difference Calculations Ii
This guided example demonstrates how to find the density of a substance, and then compare the calculation to the density listed in reference sources.
US Geological Survey
Usgs: Geologic Time
This large U.S. Geological Survey site offers a look at the age of the earth, how radiometric dating is used to calculate it, the major divisions of geologic time, and the classification and use of fossils.
National Council of Teachers of Mathematics
Nctm: Figure This: Movie Money
Do movie theaters make lots of money? You can find out when you try this math challenge that explores profit and loss in the theater industry. Discover why understanding problem solving, percent, and basic calculations are essential in...
Other
New Mexico State University: Change in Entropy
An example of a calculation of the change in entropy in a simple chemical reaction.
National Council of Teachers of Mathematics
Nctm: Figure This: Beanie Babies, Profit or Loss
Is you Beanie Baby business booming or busted! Figure out if you made a profit or lost money in this mathematic computation activity. A one page activity from the NCTM Math Challenges for Families collection that focuses on adding and...
ClassFlow
Class Flow: Division Number Line
[Free Registration/Login Required] The teacher will use this lesson plan to review the number line with 3rd grade students.