Reflection: Modeling The 10% Benchmark - Section 1: Introduction


I have taught the 10% benchmark for several years.  An old state standard required 7th grade students to estimate and solve percent problems using "mental math".  I always love teaching the percent benchmark lessons.  I always thought of them as a great way to find percents, I only recently realized that these benchmarks develop proportional reasoning.  

That being said, I realized that it helped many of my students to use a horizontal table to show how 10% of 250 can be used to find other percents of 250.  I'd place 10% above 25 on the table and then show the multiples as we found other percents.  

  Use Tables Too!
  Modeling: Use Tables Too!
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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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2 teachers like this lesson
Math, Number Sense and Operations, Percentages, percent benchmarks, percent of, 10%
  50 minutes
tenpercentbenchmark 2
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