Reflection: Checks for Understanding Circumference & Area Fluency Practice - Section 2: Whiteboard Practice


After a few problems of each type, my students were able to find the circumference and area of any circle - as long as the radius and diameter were presented as whole numbers.  Fractions really caused problems.  

When I gave a diameter like 8 1/2 and asked students to find the area many  were stumped.  I had to ask students to tell me what measure was needed to find the area.  They knew they needed the radius but the fraction made it difficult for them.  I asked them what they would do to find the area if the diameter was 10 units.  They responded, as if I were stupid, that you would divide the diameter by 2.  So then I asked, what should we do to find the radius when the diameter is 8 1/2.  I had to go through this a few times.

It's a good thing we spent so much time on this because the accelerated math practice in the next part of the lesson is full of fractions and decimals.

  Radii and Diameters - Fractions, Mixed Numbers, and Decimals
  Checks for Understanding: Radii and Diameters - Fractions, Mixed Numbers, and Decimals
Loading resource...

Circumference & Area Fluency Practice

Unit 6: Geometry
Lesson 9 of 37

Objective: SWBAT find the area and circumference of circles

Big Idea: Whiteboard practice!

  Print Lesson
2 teachers like this lesson
Math, circumference (Determining Measurements), Geometry, 7th grade, circles, area of circle
  55 minutes
laura s whiteboard
Similar Lessons
Exploring Circumference
6th Grade Math » Geometry
Big Idea: What is pi, anyway? Students explore the relationship between circumference and diameter by measuring a variety of circles and use it to derive the formula for circumference.
Somerville, MA
Environment: Urban
Andrea Palmer
Relationship Between Circumference and Diameter - What is pi?
7th Grade Math » Geometric Measurement
Big Idea: Did you say pie? or pi? Bring in a circular item for class, and it if happens to be food - AWESOME!
Elon, NC
Environment: Suburban
Heather Stephan
Old and New Knowledge of Circles
12th Grade Math » Trigonometry: Circles
Big Idea: Students explore the idea that pi and the trig ratios are really just the same shoes on different feet.
Worcester, MA
Environment: Urban
James Dunseith
Something went wrong. See details for more info
Nothing to upload