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Convergence articles

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Three equal circumferences with radii 6" are tangent to each other. Compute the area enclosed between them.
There are two piles, one containing 9 gold coins, the other 11 silver coins.

Author Keith Devlin argues that the impact of the Pisan merchant and his Arabic numbers on medieval Europe was even greater than previously thought.

This article contains examples of the use of the rule of false position in the solution of geometric problems as found in the work of Simon Stevin. We discuss the benefits for future teachers and their students.
This is a page from the Rechenbuch of Adam Riese. It deals with the measurement of barrels. Also a page that has a table showing numbers both in German words, in Roman numerals, and in the Hindu-Arabic numerals.
Three vertical posts along a straight canal, each rising to the same height above the surface of the water. By looking at the line of vision, determine, to the nearest mile, the radius of the earth.
The Fibonacci numbers and applications to areas such as plant growth and stock market predictions.
A number is required; that the square shall be equal to twice the cube.
There were two men, of whom the first had 3 small loaves of bread and the other, 2.
A five-volume set of biographies of mathematicians from ancient times to the twentieth century, aimed at secondary students.