Percent can be expressed as an amount of change. Percent has its complication and eases like in compound interest or decimals. Percents can be changed to decimals by moving the decimal point two places to the left. For example, if you have 2%, once the decimal point is moved 2 points to the left, you would end up with 0.02 as the decimal. Percent of change is compatible with percent increase and decrease; the change is the amount of which number increases or decreases. Percent increase occurs when the amount goes up and Percent decrease occurs when the amount goes down. To find percent increase/decrease, set it up in fraction form; use the specified operation (addition/subtraction) as the numerator and the original number as the denominator. Solve, Simplify then change it to a decimal to get the increase or decrease.
Ex. 15-10/15 = 5/15 = 33% decrease.
In the real-world, percent is used in many things like stock, marketing and surveys. It's important to have an understanding of the "story" behind the situation in order to apply specific strategies so it would be understood how to solve it. Word problems for percentage have various forms so we would need to know what's required to be known. Different types of problems may apply to different types of formulas or equations so it's always good to know what's specifically needed of solving.
Daniel, I liked that you started out very specific, however towards the end of your blog, you started to trail off into generalities. There are many other types of percentages that you failed to mention. In discussing the story behind a percent, I was looking for you to indicate the understanding that in a problem dealing with discount you would subtract the discount amount from the original, whereas with sales tax you would need to add that tax to the price of the item.
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