## 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!

# The 10% Benchmark

Unit 5: Percent and Proportional Relationships
Lesson 2 of 15

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

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Standards:
Subject(s):
Math, Number Sense and Operations, Percentages, percent benchmarks, percent of, 10%
50 minutes

### Grant Harris

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