The Meaning of Percentage: Comparing Percentages
This clip provides examples which illustrate the fact that, while percents "have no great mathematical importance, they're just very handy from a practical point of view."
Interpreting Graphs: Examples of Circle Graphs
This clip explores circle graphs in depth. It explains that each part of these graphs is called a sector. The clip explains that the sum of the values in the graph must equal 100%, then provides practical problems, including one in which the value o...
Ratio and Proportion: Practical Problem: French Toast, A
This clip presents a problem involving cooking ingredients needed to make French toast. As in other proportion problems, we are given three pieces of information and have to find the fourth. The problem is solved through the use of cross multiplying...
Ratio and Proportion: Proportions In the Use of Map Scales
This clip presents a problem involving the scale on a road map comparing inches to miles. The clip explains that checking the answer to see that it makes sense is especially important in proportion problems, because "Â…when the answer is wrong, it's...
Ratio and Proportion: Summary: Ratio and Proportion
This clip summarizes the key points pertaining to ratio and proportion. It explains that a ratio is a kind of fraction used to describe the relative sizes of two numbers, also noting that a proportion is a statement that two ratios are equal. The cl...
The Meaning of Percentage: Changing Fractions to Percents and Percents to Fractions
This clip explains that the easiest way to understand percent is to think of it as a proportion. The clip notes that this allows us to change fractions to decimals, and provides examples of how this is done. The clip then reverses the process and ex...
Percent in Word Problems: Practical Problems Involving Percent and Proportion
This clip establishes that percent means comparing something to 100, then presents a number of practical problems about percentage that are solved by setting up proportions and cross-multiplying.
Percent in Word Problems: Summary: Percent in Word Problems
This clip summarizes the material presented in the lesson on percent in word problems. It touches on several of the key terms and concepts, including proportions and cross-multiplying. It also mentions some of the special words that come up in busin...
Percent in Word Problems: Reviewing Proportion
This clip reiterates that proportion is the key idea in all work with percent. The clip notes that while there may be quicker ways to handle a percent problem, we can always get started with this type of problem by setting up a proportion because, "...
Percent in Word Problems: Few Problems Involving Money, A
This clip consists of word problems having to do with money, and the student is introduced to terms like discount and commission. Otherwise, the problems are very similar to others already presented, and are solved by setting up proportions and then...