1.3 Rounding in general Numbers are often approximated to make them easier to handle, but sometimes it doesn’t help very much to round to the nearest 10 or the nearest 100 if the number is very large. For example, suppose the monthly balance of payments deficit was actually £24 695 481. Rounded to the nearest 10, it's £24 695 480; and to the nearest 100, it's £24 695 500. But £24 695 500 is still a complicated number to deal with in your head. That's why it was rounded to £25 000 000 in the newspaper
Numbers are often approximated to make them easier to handle, but sometimes it doesn’t help very much to round to the nearest 10 or the nearest 100 if the number is very large. For example, suppose the monthly balance of payments deficit was actually £24 695 481. Rounded to the nearest 10, it's £24 695 480; and to the nearest 100, it's £24 695 500. But £24 695 500 is still a complicated number to deal with in your head. That's why it was rounded to £25 000 000 in the newspaper
The Roman Empire in the First Century - Episode 2: Years of Trial
Caligula grips Rome in fear; Judea's religious and political establishment finds Jesus a threat.
The Revolution: Interactive Guide App for iPad
'The American Revolution comes to life with a fully interactive textbook and study guide designed exclusively for the iPad by a high school senior with a passion for U.S. History. Journey through the formation of our country with interactive flashcards, explorable war maps, audio narrations, review quizzes, interactive biographies, and explorable images. In this interactive guide to the American Revolution, you will feel the passion of our nation's founders as they fought for independence,
PLoS ONE will be a high-volume, efficient and economical system for the publication of peer-reviewed research in all areas of science and medicine. It will provide a unique forum for community dialogue using the full potential of the web to accelerate scientific progress.
Multilingual portal for free and open content courses and tutorials that people can benefit from in daily life. Educators can also add their own educational content to the system. The content at the moment consists mainly of language and computer related material. Not all content is multilingual.
NASA CONNECT Data Analysis and Measurement: Having a Solar Blast
In NASA CONNECT Having a Solar Blast, NASA engineers and researchers use data analysis and measurement to predict solar storms, anticipate how they will affect the Earth, and improve our understanding of the Sun-Earth system. Grades 6-8.
NASA CONNECT Hidden Treasures: Landscape Archaeology
In NASA CONNECT: Landscape Archaeology: Hidden Treasures, students will learn how researchers and scientists use data collected through remote sensing to study hidden features on the Earth's surface and to discover the environmental and archaeological effects left by ancient cultures. Students will see how archaeologists use the math concepts of coordinate geometry and powerful geographic information system (GIS) software to solve current world problems by investigating clues from the past. Grad
Hurricanes on sandy shorelines: Lessons for development
A Carolina Environmental Diversity Explorations "virtual field trip" that examines the sand sharing system of sedimentary coastlines and the impact of hurricanes on those coastlines and on human development.
Explore and Discover Observing
Find an Asteroid, Comet or Other Moving Solar System Object. Follow the motions of known solar system objects. Search to discover new ones. There are countless asteroids and comets orbiting the Sun. Plenty for everyone to track and map. All are interesting. Some astronomers are searching for ones that are in Near Earth Orbit and other astronomers search for dim ones way out by the orbits of Pluto and beyond.
Directory of Open Access Journals
Directory of Open Access Journals. This service covers free, full text, quality controlled scientific and scholarly journals. We aim to cover all subjects and languages. There are now 1964 journals in the directory. Currently 482 journals are searchable at article level. As of today 81975 articles are included in the DOAJ service. The aim of the Directory of Open Access Journals is to increase the visibility and ease of use of open access scientific and scholarly journals thereby promoting thei
Pio Pico Researchers Participatory Action Research: From Classroom to Community, Transforming Teachi
Emily Wolk is a teacher of a group of students, aged 8-11 years old, called the Pio Pico Researchers. Together, since the group started in 1996, the group convinced the city of Santa Ana to install a signal light at one of the most dangerous intersections in the city, in the immediate vicinity of Pio Pico School. Wolk used an alternative inquiry method called Participatory Action-Research (PAR) with her students. The children used radar guns, plotted data on a computerized mapping system called
Cardiovascular Construction Kit
The Cardiovascular Construction Kit (CVCK) allows students to design and construct a wide range of cardiovascular systems, testing each one to see how it behaves and whether it could actually exist and survive in a real organism. CVCK provides a set of basic components, e.g., pumps, vessels, capillaries and so on, which may be pieced together to construct a cardiovascular system. Gauges and measurement techniques are provided so you can draw conclusions from your experiments. Note: CVCK is a MAC
Environmental Decision Making
Using the Extend 'connect-the-components' visual programming, students can model and simulate ecosystems including social and economic forces as well as study parameter variations to develop an understanding of ecosystem function and productivity. By making 'what if...' changes in the model, the effects of various proposed decisions about the environment can then be shown. EDM includes three ecological systems: Ponds, Grasslands, and Logging. Students can predict results of changes in the mode
Operating Systems and System Programming Fall 2008
Operating Systems and System Programming - Fall 2008. The purpose of this course is to teach the design of operating systems and other systems. Topics we will cover include concepts of operating systems and systems programming; utility programs, subsystems, multiple-program systems; processes, interprocess communication, and synchronization; memory allocation, segmentation, paging; loading and linking, libraries; resource allocation, scheduling, performance evaluation; I/O systems, storage devic
Introduction to Tourism
This course covers topics which include defining what tourism is and the tourism system. It then reviews the development of tourism and tourist destinations before embarking on examining the tourist product and tourist industry. Where would tourism be without marketing? The course then explores market segmentation and then discusses the economic, socio-cultural and environmental impacts which must be considered when planning for tourism and the future of tourism.
Volcanoes is an interdisciplinary set of materials for grades 4-8. Through the story of the 1980 eruption of Mount St. Helens, students will answer fundamental questions about volcanoes: "What is a volcano?" "Where do volcanoes occur and why?" "What are the effects of volcanoes on the Earth system?" "What are the risks and the benefits of living near volcanoes?" "Can scientists forecast volcanic eruptions?" This teaching packet reflects the goals of the National Science Education Standards deve
Mineral Resources On-Line Spatial Data
This site is provided by the Mineral Resources Program (MRP) of the U.S. Geologic Survey. It is an online geographic information system which covers Earth and the United States. Layers which can be turned on and off feature information on mineral resources, soils, sediments, geologic features, cultural features, land cover, elevation, gravity data, and magnetic data.
Soil Change Guide - Procedures for Soil Survey and Resource Inventory
This Guide is designed for soil survey, vegetation, and ecological site or unit inventory work in order to help soil scientists and other inventory specialists collect interpretable data about soil change within the human time scale. This Guide describes a sampling system to measure dynamic soil properties for all major land uses (except urban lands where the land and soil have been significantly reshaped). The Guide includes instructions for project planning, field execution, and data analysis
Web Soil Survey
Web Soil Survey (WSS) provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service (NRCS) and provides access to the largest natural resource information system in the world. NRCS has soil maps and data available online for more than 95 percent of the nation’s counties and anticipates having 100 percent in the near future. The site is updated and maintained online as the single authoritative source of soi
The Redistricting Game is designed to educate, engage and empower citizens around the issue of political redistricting. Currently, the political system in most states allows the state legislators themselves to draw the lines. This system is subject to a wide range of abuses and manipulations that encourage incumbents to draw districts which protect their seats rather than risk an open contest. By explore how the system works, as well as how open it is to abuse, The Redistricting Game allows play