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Convergence articles

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Apollonius found how to draw normals to an ellipse from points in the ellipse by using hyperbolas. A modern version is presented here.
A fox, a raccoon, and a hound pass through customs and together pay 111 coins.

Here are all articles, classroom activities, and reviews arranged into annual volumes starting with 2004.

Find the two numbers such that multiplying one by the other makes 8 and the sum of their squares is 27
To find three quantities x.y, and z...
I found a stone but did not weigh it; after I added to it 1/7 of its weight and then 1/11 of this new weight, I weighed the total at 1 mina. What was the weight of the stone?
A boy gives 11 coins of equal denomination to a man, and the man finds that their total value in yen is 4 less than his age.
A water tub holds 73 gallons; the pipe which fills it usually admits 7 gallons in 5 minutes; and the tap discharges 20 gallons in 17 minutes.

An introduction to the prime numbers in many of their aspects.

The movie Agora, about the mathematician Hypatia of Alexandria (c. 400 AD), is spectacular and intriguing but Hypatia should be portrayed as the hero she was.