Reflection: Developing a Conceptual Understanding Percent Change - By What Percent Did the Value Change? - Section 2: Explore


In the past I have always taught this concept using the ratio: difference/original.  However, in an effort to keep things simple and not change the rules on kids - I approached percent change by using the percent equation - the same equation we have been using.  I did not want students to have to remember an additional equation when the one they are already working with works :)  Thus, to bring in the concept of change - once we worked backward to get the answer, students had to determine how much the percent changed from 100%.  I kept reminding them that 100% is status quo - so how did we change the value, did we go up or down from 100%, and by how much?

Students seemed to grasp this method of teaching it better than they have in the past.  I guess I will see over the next few days as students work with a mixed set of problems.  See attached smartboard notes for how the class went!

  Developing a Conceptual Understanding: Explore Reflection
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Percent Change - By What Percent Did the Value Change?

Unit 3: Percents
Lesson 16 of 21

Objective: Students will be able to calculate percent of change.

Big Idea: By what percent did the value change? Can you relate percent change to what we already know how to do? This lesson provides multiple methods of solving.

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2013 04 23 12 06 09
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