Percentages and Percent Composition Created by The North Carolina School of Science and Math.The...
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Transcript of Percentages and Percent Composition Created by The North Carolina School of Science and Math.The...
Percentages and Percent Composition
Created by The North Carolina School of Science and Math. Copyright 2012. North Carolina Department of Public Instruction.
Percentages
Percent
Percentages
Examples?
30%0.5%120%
Number of People who Like This Team
Duke = 50 Carolina = 30NC State = 20 Other = 5
Percentages: Basic Equation
• A basic equation to help you solve problems with percentages:
Percentage = () x 100
Percentages: Types of Problems
What you Know What you are Trying to Find
Whole and Part PercentageWhole and Percentage
Part
Percentage and Part
Whole
Percentages: Examples
You are testing a airplane wing design in a wind tunnel. You complete 20 trials total. Only 15 of these trials were successful. What percentage of trials were successful?
Percentages: Examples
You are studying a specific metal alloy. You know that 10% of the alloy is made of steel. If you have a 50 gram sample of this material, how much of the material is steel?
Percentages: Examples
You have spent $120.00 on various materials for the prototype which you are designing. You know this is 80% of your design budget. What is your total budget?
Percent Composition
In Material Science…• Percent Composition is used to determine the
amount of each element in a compound
Why should Engineers care about this?