## Reflection: Checks for Understanding Drawing Bar Models to Represent Percents of Increase and Decrease - Section 3: Bar Model Practice

I provided a 10% bar model and a 25% bar model as examples to simplify the work.  While I was walking around observing students working, I was happy to see that several students were able to use other models.  On problems 3, 8, and 9 several students used a 20% bar model.  That is what I would use myself so I was glad to see it being used even though I didn't introduce it.

For problem number 4 - a 50% increase - I saw a few different models.  I purposely choose this value to see whether students would use the 10% or 25% model.  Many choose on of these models and some chose a 50% model.

Other Bar Models
Checks for Understanding: Other Bar Models

# Drawing Bar Models to Represent Percents of Increase and Decrease

Unit 5: Percent and Proportional Relationships
Lesson 5 of 15

## Big Idea: Students practice drawing bar models for percent increase and decrease problems.

Print Lesson
4 teachers like this lesson
Standards:
Subject(s):
Math, Number Sense and Operations, Percentages, percent increase, percent decrease, bar models
40 minutes

### Grant Harris

##### 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?
Favorites(12)
Resources(14)
Hope, IN
Environment: Rural

###### 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.
Favorites(7)
Resources(15)
Elon, NC
Environment: Suburban

###### 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.
Favorites(4)
Resources(31)
Worcester, MA
Environment: Urban