Introduction: Connecting Your Learning Show
Within the IT field, percentages are used to study how resources are being used on a computer or how much bandwidth is being consumed on a network based upon the maximum capacity of the network. You will also need to be mindful of ratios and proportions used for the screen resolutions of mobile devices in order to properly design a mobile application. In this section, you will learn to convert between each of these formats (decimals, percents, and fractions). Focusing Your Learning
Lesson ObjectivesBy the end of this lesson, you should be able to:
Key TermsPresentationRatios and PercentsA ratio is defined as the comparison of one size of a number to the size of another number. A most convenient number to use when comparing numbers is 100. Ratios in which one number is compared to 100 are called percents. The word percent comes from the Latin word per centum. The word per means "for each" or "for every," and the word centum means "hundred." Thus, you have the following definition. Percent means "for each hundred," or "for every hundred."
In order to better understand percents, take a look at the following examples. Notice that 50 of the 100 squares in the grid below have been shaded green. This represents 50% (50 per 100). 50 out of 100 or 50 percent or
The Relationship between Fractions, Decimals, and Percents – Making ConversionsSince a percent is a ratio a ratio can be written as a fraction, and a fraction can be written as a decimal. This means any of these forms can be converted to any of the others. Look at the chart below for detailed information on how to make conversions between fractions, decimals, and percents. Table 1: Conversion Techniques – Fractions, Decimals, Percents
Review the examples below which provide detailed steps for converting to fractions, decimals and percents.
Watch the following Khan Academy video about decimals, percents, and fractions. You will see additional examples that can help you better understand these new concepts. Summarizing Your LearningPercents are a common way to represent decimal or fractional amounts. Any number that can be written as a decimal, fraction, or percent can also be written using the other two representations. Now that you have finished Lesson 1 in this module, you are encouraged to conduct additional research into how these topics pertain to your particular area of study within the IT world. You probably don't have to look much farther than your computer screen. Most computers have the ability to zoom in or out. This zoom feature is typically characterized with a percentage. With this simple computer feature, you can zoom out to see the whole world on Google Earth or zoom in to see your personal vehicle sitting in your drive way. Assessing Your Learning
Resource: “Ratios and Rates: Percent” by Ellis, W., & Burzynski, D. © 2010 retrieved from http://cnx.org/content/m34983/1.2/ is used under a Creative Commons Attribution http://creativecommons.org/licenses/by/3.0/. This is an adaption of the lesson titled,“Converting: Fractions, Decimals, and Percents,” by the National Information Security and Geospatial Technologies Consortium (NISGTC) is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0. How do you convert between fractions decimals and percentages?To a percent: Convert the fraction first to a decimal, then move the decimal point 2 places to the right and add the % symbol. To a percent: Move the decimal point 2 places to the right and add the % symbol. To a fraction: Drop the % sign and write the number "over" 100.
How do you convert a decimal percent to a decimal?To convert a percentage to a decimal, divide by 100. So 25% is 25/100, or 0.25. To convert a decimal to a percentage, multiply by 100 (just move the decimal point 2 places to the right).
How do you convert decimals to fractions?Decimals can be written in fraction form. To convert a decimal to a fraction, place the decimal number over its place value. For example, in 0.6, the six is in the tenths place, so we place 6 over 10 to create the equivalent fraction, 6/10.
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