Category Archives: 3 Act Math

Surface Area of Cylinders

Another 3 Act Math Lesson!

Act 1

I’m starting to make my own videos to match the grade 8 curriculum.

This is Act 2.  Ideally, I would have actually wrapped the Pringles can with paper but….sometimes time is a factor so I have an ongoing goal to keep adding videos when I have time.  🙂


Working on it:


We discovered all of this!

cylinder images surface area formula



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3 Act Math Investigations!

We are loving the 3 Act (or 4 Act) lesson investigations in math.  They start with a “trailer video” that the students watch first.  They generate a number of possible math questions that could go with the video.  This really gets them thinking about math in the real world and situation where they might use math.  It also activates prior knowledge they have.
Next we watch Act 2 which provides some more information and a problem to solve.  The students solve the problem, present their solutions and then we watch Act 3.
Here is the first one we did.  It was created by Kyle Pearce @mathletepearce at Tap Into Teen Minds
Cookie Cutter
Act 1
The students came up with many excellent questions including the questions we were going for:  How many more cookies can we make?
Act 2
Here is some video of two of my students sharing their solution.  I started to use the time-lapse feature on my iPhone and we found it is too fast.  I’ve downloaded an App now that I hope will be better for next time.
Finally, we watch Act 3
We had some discussion about why Kyle Pearce was able to get more cookies than we calculated.  What do you think?
I started blogging for this class on Evernote and but I found it didn’t have the features I need so I’m continuing on here.  If you want to see the first few lessons leading up to this check them out here.  They give some background on Pi, deriving the formula for the area of a circle and Mindset.
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Posted by on February 23, 2015 in 3 Act Math, Math, Measurement


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