Reflection: Connection to Prior Knowledge Finding the Area of a Rectangle - Section 4: Roundtable

 

Question 7 was a little challenging for my students.  The students have to find the length of a side given the area and the width.  I had a proud teacher-mom moment when one of my students came to the board to explain how he solved this problem.

 

He said...

I know that the area formula for a rectangle is a multiplication equation.  So I substituted 600 in the for the area and 30 in for the width.  In order to solve this equation, I have to do the inverse and divide both sides by 30 which results in a length of 20.  I checked this by multiplying 20 by 30 to see if made 600.  So impressed.

Most students knew they could divide 600 by 20, but they didn't make the mathematical and strategical leap like this student did.  Using the above method is the goal I have for my students.  Seeing patterns and making generalizations uses MP 7 and MP 8 which is one of the hardest practices to implement.  

  A great connection
  Connection to Prior Knowledge: A great connection
Loading resource...
 

Finding the Area of a Rectangle

Unit 8: Geometry
Lesson 1 of 17

Objective: SWBAT use the area formula for rectangles to solve real world and mathematical problems.

Big Idea: Understanding area and using formulas is a skill used in Algebra and Geometry.

  Print Lesson
22 teachers like this lesson
777363 pool table
 
1
2
3
4
5
Similar Lessons
 
Rectangles with the Same Area and Different Perimeters
6th Grade Math » Area of Two Dimensional Figures
Big Idea: Rectangles that have the same area can have different perimeters.
  Favorites(12)
  Resources(18)
New Haven, CT
Environment: Urban
Carla Seeger
 
Quadrilaterals and the Coordinate Plane
6th Grade Math » Geometry
Big Idea: A fun and challenging lesson on quadrilaterals
  Favorites(7)
  Resources(18)
Somerville, MA
Environment: Urban
Andrea Palmer
 
Developing the Area Formulas for Regular Polygons
6th Grade Math » Geometry
Big Idea: Students discover the relationships between regular polygons.
  Favorites(1)
  Resources(15)
Brooklyn, NY
Environment: Urban
Ursula Lovings
 
 
Something went wrong. See details for more info
Nothing to upload
details
close