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
Loading resource...

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.

  Print Lesson
2 teachers like this lesson
Math, Number Sense and Operations, Percentages, percent benchmarks, percent of, 10%
  50 minutes
tenpercentbenchmark 2
Similar Lessons
Balancing Act
7th Grade Science » Energy, Force & Motion
Big Idea: Can objects of different mass be arranged so they balance one another? Is there a mathematical equation that can predict balance?
Hope, IN
Environment: Rural
Deborah Gaff
Volume of Prisms and Pyramids Fluency Practice
7th Grade Math » Geometric Measurement
Big Idea: Practice makes perfect – students will work on fluency of finding volume of prisms and pyramids.
Elon, NC
Environment: Suburban
Heather Stephan
The Defining Pi Project, Day 1
12th Grade Math » Trigonometry: Circles
Big Idea: Students assess the precision of historical approximations of pi, then attend to precision as they set out to calculate the number on their own.
Worcester, MA
Environment: Urban
James Dunseith
Something went wrong. See details for more info
Nothing to upload