Mathematical+Reflections,+p.+25

JO** 7 girl swimmers/5 boy swimmers, 7 girl swimmers/12 total swimmers 6 girl soccer plagers/9 boy soccer players, 9 boy soccer/15 total soccer players
 * 1-25-09
 * Big idea:** Many important practical and mathematical applications involve comparing quantities of one kind or another; it is important to know which method to use and how we should use them.  **Essential Questions:** What methods are there for comparing things?
 * Notes from class:**


 * we round to the 100th place because percents are out of 100

**__ Mathematical Reflection Pg.25 __** You would want to use the percents when you are making a sale price for an object you are about to sell. You would want to compare the original price from the sale price. For example, you are having a 30% off sale, and the original price is $100, then you would do, 100 x 30/100 = 30. 100 – 30 = $70.  So the original price would be $100 and the discount price would be $70. Percents are useful when you are making comparisons because they can easily let you find out the comparison for example what I did on part 1 and 2. You can turn them into fractions and then do the math. Or you can turn fractions into percents and compare which is bigger or smaller. And you can get the visual what the price would be when its percent instead of showing the ratio which would make you calculate to get the visual price. When you are just trying to find the differences between two numbers you can use the differences comparison where you write down how much it outnumbered. For example, trying to find out how many people preferred television by radio. Yes you can find a percent comparison from a ration comparison. Because the ratio comparison is just like a fraction. And a fraction can be turned into a percentage. And after that, you can do the process of finding the percentage comparison. For example: 16:50 can be turned into 32/100. In other words, 32/100 is 32%.
 * 1. Give an example of a situation in which it makes sense to use percents to make comparisons. **
 * 2. Using your example from part 1, show how to make a comparison using percents. **
 * 3. Explain why percents are useful for making comparisons. **
 * 4. Give an example of a situation in which you think another form of comparison is better than percents. Explain your reasoning **
 * 5. Can you find a percent comparison from a ratio comparison? Explain how, or tell what additional information you would need. **