Reflection: Connection to Prior Knowledge The 10% Benchmark - Section 2: Guided Problem Solving


I made an assumption again.  What is it they say about assuming?  My students seemed to grasp finding 10% of a number without much difficulty.  I thought that meant they were ready for the problems in the guided problem solving section.  As students were working, I noticed strange answers to the circle graph problems.  Students were saying there were .1 books.  I quickly realized they didn't realize that the circle graph represents the total number of books - 400.  They did not understand that to find the total number of history books, for example, it would be necessary to find 20% of 400.  

Before common core standards, there was a state standard for 7th grade that specifically mentioned circle graphs.  I always made sure to write a couple of lessons about interpreting these graphs.  Here, I took it for granted that students would figure out how to read the graph.  I had to stop students from working to explain how to interpret a circle graph.  I do not think an entire lesson is necessary, but in the future, I'll make sure to discuss the circle graph first.  

  Assuming and Circle Graphs
  Connection to Prior Knowledge: Assuming and Circle Graphs
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The 10% Benchmark

Unit 5: Percent and Proportional Relationships
Lesson 2 of 15

Objective: SWBAT find the percent of a number using 10% as a benchmark

Big Idea: If you can find 10% of a number, you can easily find many other percents of that number.

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6 teachers like this lesson
Math, Number Sense and Operations, Percentages, percent benchmarks, percent of, 10%
  50 minutes
tenpercentbenchmark 2
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