Reflection: Modeling A Percent Equation - Section 1: Introduction


The "what percent" problems always cause a bit of difficult for many of my students.  The can easily find the part using the equation.  They can also find the whole using the equation.  Finding the percent using the equation is trickier.  I think it is because when you have solved the equation you are left with a part-whole ratio like 9.5 / 20.  Students needed to understand that this is another representation of a percent.  Once I point this out, the difficulties go away quickly.  Most students see that they can write 9.5 / 20 as 47.5 / 100 or 47.5%.  

In my everyday life, I probably would go straight to the ratio when trying to decide 9.5 is what percent of 20.  I might even tell this to my students.  But the point of this lesson is for students to be well versed in using a simple equation to solve percent problems.   

  9.5 is what percent of 25? What?
  Modeling: 9.5 is what percent of 25? What?
Loading resource...

A Percent Equation

Unit 5: Percent and Proportional Relationships
Lesson 10 of 15

Objective: SWBAT solve percent problems using an equation

Big Idea: Solve 3 types of percent problems using 1 equation!

  Print Lesson
12 teachers like this lesson
Math, Number Sense and Operations, Percentages, equation, percent equation, what percent
  50 minutes
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