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Locker-Problem Demonstration: Part II
DrJamesTanton
428 views
In this video we explain the result of the demonstration done by St. Mark's School students. (And then we add a challenge!)
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Locker-Puzzle Demonstration: Part I
DrJamesTanton
450 views
In this first of two videos students of St. Mark's School act out the famous locker problem. In the follow-up video we explain the results!
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Which Mean do you Mean? (Tanton: Mathematics)
DrJamesTanton
277 views
Here is a classic little word problem whose ambiguity opens to the world of means: Which mean do you mean and what do you want a mean to be?
Let's learn about the arithm...
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Path Walking and Probability Theory
DrJamesTanton
590 views
Here is an interesting way to explain some basics in probability theory - why "or" translates to plus and "and" to multiplication. But more important, these path walking pu...
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The Discriminant of a Quadratic: YOU DON"T NEED IT!
DrJamesTanton
671 views
In this video (with a typo in the title!!) I explain how one need not know "b^2-4ac" to answer those dreary algebra questions. AND .. I argue it is more meaningful for stud...
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Average Age Puzzle
DrJamesTanton
330 views
Ten students sit in a circle. Their ages happen to have the astounding property that the age of any one student equals the average of the ages of her two immediate neighbou...
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Divisibility By 11
DrJamesTanton
682 views
Here is a second video on the rule for testing divisibility by 11. Is the reverse of a multiple of 11 again a multiple of eleven? (Yes) Is every even palindrome a multiple ...
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There are more Traingular Numbers than Square Numbers
DrJamesTanton
900 views
There are certainly infinitely many square numbers (1,4,9,16, ..) and infinitely many triangular numbers (1,3,6,10,15, ...) but in a very real sense one can say that there ...
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Sum from 1 to N: A visual approach
DrJamesTanton
476 views
There is a classic tale of young Gauss summing the numbers from 1 to 100. But I prefer a more ancient Greek approach to v
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Revised(!!) Addendum to the Boy-Boy Paradox
DrJamesTanton
313 views
Okay ... Here is a revised addendum to the Boy-Boy Paradox video. I hope I have done a decent enough job this time of make the subtle of ambiguities of the puzzle clear. (I...
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