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Convergence articles

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The earliest known example of a printed book on arithmetic, dates to 1478. Also known as the Art of Calculation.
A wonderful survey of the history of mathematics, emphasizing its relationship with the ambient culture.
The latest HPM Newsletter is now available here. Read it!

A compilation of ethnomathematical ideas from around the world.

An elementary introduction to Euler squares and how they can be used in teacher training

What is the perpendicular height of a cloud when its angles of elevation were 35 degrees and 64 degrees as taken by two observers?

Page 9, Images from Paul Halmos Photograph Collection: Burkholder, Butzer, Calderon, Chern, et al

Determine the radii of three equal circles described within and tangent to a given circle, and also tangent to each other.

This is the title page of the Siderius Nuncius (Starry Messenger) of Galileo (1564-1642), published in 1610. This book was a report on Galileo's first investigations with a telescope. Also includes Galileo's initial sketches of the surface of the moon.

The steamer, Katie, leaves the wharf at New Orleans and runs an average speed of 15 mph. When Katie had gone 25 miles, the steamer R.E. Lee leaves the wharf and runs the average speed of 18 mph. How far will the Lee go before she overtakes the Katie?