A square walled city of unknown dimensions has four gates, one at the center of each side.

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A square walled city of unknown dimensions has four gates, one at the center of each side.

A man bought a number of sheep for $225; 10 of them having died, he sold 4/5 of the remainder for the same cost and received $150 for them. How many did he buy?

If 80 dollars worth of provisions will serve 20 men for 25 days, what number of men will the same amount of provisions serve for 10 days?

Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.

A collection of 24 mini-posters, each containing a quotation about mathematics.

An oblong garden is a half yard longer than it is wide and consists entirely of a gravel walk...

Archimedes' work, The Method, explained, along with many other important ideas of the great Greek geometer.

A journey through numbers from their earliest beginning in India to the proof of Fermat's Last Theorem by Wiles.

Benjamin Banneker solved some trigonometry problems in his extant notebooks. One of them is discussed here. The authors have also discovered the probable source of Banneker's trigonometry table.

A detailed study of the cycles of the Mayan calendar, along with some other ancient calendars.