These numbers have some personality! Are they rational or irrational? The lesson examines the definitions of rational and irrational numbers and shows examples of how to identify them. 

How do you operate with numbers in scientific notation? The resource provides examples on how to divide and multiply with numbers written in scientific notation. The handout and video also cover the procedure for addition and subtraction...

You mean the square root of five and five don't have the same value? Learners estimate the value of irrational roots. As they practice estimating the value, they increase their understanding of roots. The lesson is the fourth in a series...

You can't evaluate an irrational root expression without a calculator—or can you? Scholars estimate the value of roots within an expression to approximate the value of the expression. Expressions include a mix of square roots and whole...

How much rain can that cloud make? Through a simulation, the class estimates the amount of candy rain contained in different cup clouds. After probing the clouds using different methods, class members adjust their estimates. Participants...

Tune in for savings! Scholars investigate pricing schemes for two different online music download sites. After comparing the two, they determine the numbers of songs for which each site would be cheaper.

Third graders complete water activities including vocabulary, visualization and performing activities. They study water vocabulary words in both English and Spanish. They listen to a read aloud of Jane Yolen's, Letting Swift River Go,...

Table broken down by country showing estimated numbers of Jewish people killed in each area during World War II.

The lesson explores how to round numbers. Explanations and examples are included in the tutorial.

Dozens of statistical terms are defined and illustrated in this glossary.

This is a resource for many topics in probability and statistics. Click on the topic of your choice for an explanation. The sites you will be linked to are quite extensive. A degree of higher-level math is necessary for understanding...

A fact sheet listing the numbers of military service members, deaths, and woundings in each war America has been involved in since the American Revolution. It also gives names of the last survivors of earlier wars, estimates of living...

The America that greeted the first Europeans was, thus, far from an empty wilderness. It is now thought that as many people lived in the Western Hemisphere as in Western Europe at that time -- about 40 million. Estimates of the number of...

Defines the term species and the origin of the concept. Provides estimates of numbers of species in different biological categories, explains what endangered species are, and what ring species are. (Published: May 26, 2010)

Latinos, also referred to as Hispanics, lived in North Carolina in relatively small numbers until the 1980s, when many people of Mexican and Central American descent began coming to the state in search of seasonal farm work. By the end...