Discover how percents and proportions help explain issues like climate change, composting, and zero waste in this video from KQED. In the accompanying classroom activity, students estimate the percentage of various types of trash that...

Convert decimals to percentages with this calculator. Input a decimal number to convert both the whole number and decimal part of the number to a percent value.

By the end of this section, you will be able to do the following: Determine the appropriate number of significant figures in both addition and subtraction, as well as multiplication and division calculations and Calculate the percent...

Students will learn and reinforce skills for equivalent conversions of fractions, decimals and percents.

This is a collection of math games ranging from Kindergarten to the upper elementary grades, using only an ordinary deck of playing cards. There are games covering addition, subtraction, multiplication, division, fractions, percents,...

Explains and demonstrates how to calculate the percentage increase from year to year and how to calculate it using an Excel spreadsheet.

The general manager of a fitness center explains how numerical calculations, percentages, and ratios are critical to his job in this video from KAET. In the accompanying classroom activity, students explore percentages, fractions, and...

Get the facts about seabirds. This group of birds makes up about three percent of the various species, even though two-thirds of the Earth is covered in water. Learn some unique facts and characteristics of seabirds. Also included in...

United Nations world population statistics on percent of youth and elderly in every country. Organized into a chart.

Use Glencoe's randomly generated self-checking quiz to test your knowledge of making predictions using surveys. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the...

Practice your arithmetic skills as you estimate the answer to questions involving addition, subtraction, multiplication, and division. Includes whole numbers, fractions, and percents. As you answer questions, you guide penguins across an...

"Silent Cal", Calvin Coolidge, was the 30th President of the United States. This article briefly examines the campaign and election that saw Coolidge, win in 1924, by 54 percent of the vote.

Learn about the relationship between vapor pressure of water and capacity of air to hold water vapor, the relationship between relative humidity and partial pressure of water vapor in the air, and how to calculate vapor density,...

By the time Hurricane Katrina made landfall near Buras, Louisiana early on the morning of August 29, 2005, the flooding had already begun. In all, levees and floodwalls in New Orleans and surrounding areas fell in more than 50 locations...

Freshwater accounts for only some 6 percent of the world's water supply, but is essential for human uses such as drinking, agriculture, manufacturing, and sanitation. As discussed above, two-thirds of global freshwater is found underground.

The American Hispanic/Latinx history is a rich, diverse and long one, with immigrants, refugees and Spanish-speaking or Indigenous people living in the United States since long before the nation was established. America's Hispanic...

America's interstate highway system cut through the heart of dozens of urban neighborhoods. Congress approved the Federal-Aid Highway Act of 1956, authorizing what was then the largest public works program in U.S. history. It promised to...

Read about the ideal of social equality in the North in the early and mid-1800s and determine if upward mobility was really a possibility for even unskilled laborers.

This resource provides both long term and current national employment information and statistics.

Using a Thomas Nast political cartoon from 1864, the author explains Lincoln's plan for Reconstruction, a plan that was never to be carried out.

Illustrated examples partnered with follow-up practice problems for interpreting proportional relationships.

In this task on exponential decay, students calculate what the amount of Carbon 14 left in a preserved plant will be as time passes and when one microgram will be all that is left. Aligns with F-LE.A.1.c.

In this task, students are shown a table of U.S. population data between 1790 and 1860 and are asked to explore whether exponential functions would be appropriate to model relationships within the data. The purpose of the task is to help...

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...