Category: Algebra

Copyright Math

This is a short TED Talk by Rob Reid (The $8 billion iPad) that tries to infuse a little “reasonability test” into our blind belief in the numbers provided by those with self-interest … in this case, the music/entertainment industry.   There are several examples that you could turn into signed number addition or subtraction problems.  In my favorite example (about 2:57 in the video), Reid uses what he calls “Copyright Math” to “prove” that by their own calculations, the job losses in the movie industry that came with the Internet must have resulted in a negative number of...

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Scale of the Universe

One of my former students (who is still a Twitter user) pointed me to this fantastic animation of powers of 10 meters, called “Scale of the Universe 2.”  I think you’ll appreciate the design and relevance of the objects the authors, Cary and Michael Huang, use to help the user to understand the relevance of scale.  Just like Powers of 10, you can zoom from the smallest part of a cell to the edges of the universe.     The authors have a collection of science- and math-oriented animations at HTwins.net that might be worth checking out too.  They also have...

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Collection of Math Games

To view the collections of Math Games, hover over the Games Menu, and go to one of the dropdown categories.   Possibly Related Posts: Contemporary Algebra Collection (new resources 2/4/2019) Add Graphs In The World to Courses Bringing the Real World to Your Math Class Every Day Taking the Algebra Out of College Algebra Group Exploration in...

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Signed Numbers: Colored Counters in a “Sea of Zeros”

The “colored counter” method is an old tried-and-true method for teaching the concept of adding signed numbers.  However, to show subtraction with the colored counter method has always seemed painful to me … that is, until I altered the method slightly. Now all problems are demonstrated within a “Sea of Zeros” and when you need to take away counters, you can simply borrow from the infinite sea.  Voila!  Here’s a short video to demonstrate addition and subtraction of integers using the “Sea of Zeros” method.  You can print some Colored Counter Paper here. Video: Colored Counters in a Sea...

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Battling Bad Science (and Statistics)

If you ever needed a REASON to calculate the highest point of a parabola that opens downward, here’s one. Possibly Related Posts: Contemporary Algebra Collection (new resources 2/4/2019) Teaching in Higher Ed Podcast about ESIL Lens Add Graphs In The World to Courses Bringing the Real World to Your Math Class Every Day Taking the Algebra Out of College...

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