Reflection: Developing a Conceptual Understanding Multiple Percents - What happens when you have a discount and tax? - Section 2: Explore

 

As I was sort of anticipating, many groups thought the sweater would be free!  I did not originally have this question in my lesson, I added it after block 1 (my advanced group) because they needed proof that you could not just add percents.  The 50/50 discount is a great example because it hits home with kids that stores do not just give stuff away, so you must not be able to add the percents.  I have included some video clips of groups discussing the question and trying to come up with an answer.  I only had 5 tables the whole day get the question right before I taught the lesson!

  Developing a Conceptual Understanding: Discussion Question Reflection
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Multiple Percents - What happens when you have a discount and tax?

Unit 3: Percents
Lesson 8 of 21

Objective: Students will be able to solve problems involving multiple percentages.

Big Idea: No no no!!! You CANNOT combine percents! In this lesson students will learn to avoid making one of the most popular percent mistakes.

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Subject(s):
Math, Number Sense and Operations, percent, markup, markdown, tax, discount, 7th grade
  60 minutes
2013 04 23 12 07 06
 
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