Range hood curved sides problem

9 April 2014

range hood
A manufactures of range hoods with curved sides wants to know what shape to cut the sheets.

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New z-Table interactive graph

3 February 2014

z-curve interactive
Investigate the meaning of the z-table using this interactive graph.

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Friday math movie: Complex numbers in math class

24 January 2014

Complex number lesson
This is a very creative way to present a lesson – funny, too.

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Updated Math of Beauty interactive

14 January 2014

math of beauty
This interactive allows you to place a mask over the photos of so-called beautiful people, and see how close their face is to the ideal.

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Friday math movie: Four Cable Drawing Machine

10 January 2014

Sand art
This reminds me of Spirograph images that brought art and geometry together, and always had an element of mystery to them.

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When does log(x-3) = log x – log 3?

26 October 2013

intersecting log curves
A recent comment from a Twitter colleague got me thinking about the value of graphical solutions of equations.

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Friday math movie: Smart failure for a fast-changing world

4 October 2013

Smart failure
We don’t deal with failure properly in most educational settings. This talk gives some options for improving that.

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Updated matrix interactive

2 October 2013

Matrices interactive applet
Here’s an applet where you can investigate how matrix operations work.

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Friday math movie: Imaginary Number

20 September 2013

Imaginary numbers
Imaginary numbers are the result of some mathematical creativity, but have many applications in science and engineering.

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Friday math movie: A clever way to estimate enormous numbers

6 September 2013

Making estimates using powers of 10This video shows how to use powers of 10 to make estimates of large numbers.

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