Embedded Files
Lesson overview
Lesson overview
Watch the video for an introduction to the lesson.
Refresher - Rounding numbers
Refresher - Rounding numbers
Watch the video Math Antics - Rounding to remind you how to round decimals.
Note: The video is set to start at 7:02 as that is the section you will find most helpful.
Math Antics - Rounding
Duration: 3:38
Activity 1 - Rounding practise
Activity 1 - Rounding practise
Practise rounding decimals by completing the Rounding to the nearest whole number activity on the Transum.org website.
Work your way up to level 3 if you can.
Open the interactive in a new tab by clicking on the image.
Activity 2 - Big circles
Activity 2 - Big circles
Task 1
Task 1
Watch this video to learn how to calculate the circumference of a circle.
Did you know? In 1893 George W Ferris constructed the world’s first Ferris wheel. Since then, there have been many wheels built around the world in various sizes.
Task 2
Task 2
Use the interactive to look at 9 of the tallest “observation wheels” in the world.
Use the information on the slides to calculate the circumference for each one and round to the nearest whole number.
Check your results by typing the answer into the interactive.
What do you notice about the circumferences? Especially for wheels of similar height?
Activity 3 - Diameter vs circumference
Activity 3 - Diameter vs circumference
Task 1 - Graphing
Task 1 - Graphing
Complete the Desmos activity Diameter vs Circumference.
Open the Desmos interactive in a new tab by clicking on the image.
Look at the table of values on the left hand side.
Calculate the circumference for each diameter, rounding your answer to the nearest whole number.
Add your answers to the table in Desmos so that you can see a graph of the results.
Screenshot or snip a copy of your completed graph.
Task 2 - Describing the relationship
Task 2 - Describing the relationship
Use your completed graph from the Desmos task to complete the Diameter vs circumference Google Doc activity.
Click on the button to open a new tab and view the Google Doc.
Click on the Use Template button to create a copy for you to edit.
Activity 4 - Tree diameters
Activity 4 - Tree diameters
Measuring the circumference of a tree can help us estimate its age and diameter.
The diameter often correlates with the tree’s wood volume. This helps foresters to estimate the amount of volume in a tree, its timber value, and how it should be managed and used.
Task - Measure some trees!
Task - Measure some trees!
Head outside to measure 5 large trees.
Complete the task using the investigation report Google Doc.
Click on the button to open a new tab and view the Google Doc.
Click on the Use Template button to create a copy for you to edit.
Activities too easy?
Activities too easy?
Task 1
Task 1
Watch the video, How Eratosthenes calculated the Earth's circumference on YouTube.
Task 2
Task 2
Complete the puzzle on the Perimeter & Circumference page of the Open Middle website.
Handing in your work
Handing in your work
Don't forget to hand in the work you completed today!
Your teacher will have told you to do one of the following:
Upload any digital documents you created and any photos you took of your written work to your Learning Management system (MS Teams, Google Classroom for example).
Email any digital documents you created and any photos you took of your written work to your teacher.
Make sure you keep any hand written work you did in your exercise book or folder as your teacher may need to see these when you are back in class.
Student reflection
Student reflection
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