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Math T-shirts
The following are the three finalists for the T-shirt contest sponsored by the Mathematical Association of America. Source:...
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Thoughts on 1/7 and other rational numbers (Part 7)
In a previous post concerning roundoff error, I mentioned that the number equals In other words, the binary expansion of is That’s the expansion of the fraction in base , as opposed to base . In the...
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How high can you count on two hands?
How high can you count on two hands? The answer is 1023, if you use binary. I made the following video to demonstrate this to my students. True story: This is a trick that I came up with when I was 10...
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Lessons from teaching gifted elementary school students (Part 3b)
Every so often, I’ll informally teach a class of gifted elementary-school students. I greatly enjoy interacting with them, and I especially enjoy the questions they pose. Often these children pose...
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Lychrel Numbers
A friend of mine posted the following on Facebook (with names redacted): So [my daughter] comes home with this assignment: For each number from 10 – 99, carry out the following process. If the number...
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My Mathematical Magic Show: Part 4c
Last March, on Pi Day (March 14, 2015), I put together a mathematical magic show for the Pi Day festivities at our local library, compiling various tricks that I teach to our future secondary teachers....
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My Mathematical Magic Show: Part 4d
Last March, on Pi Day (March 14, 2015), I put together a mathematical magic show for the Pi Day festivities at our local library, compiling various tricks that I teach to our future secondary teachers....
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999 Megabytes
This made me laugh… …though I would have laughed harder if the band was called 1023 Megabytes. Source:...
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My Mathematical Magic Show: Index
I’m doing something that I should have done a long time ago: collecting a series of posts into one single post. Here’s my series on the mathematical magic show that I’ll perform from time to time. Part...
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