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Convergence articles

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The highest point of the Andes is about 4 miles above sea level.
I have two fields of grain. From the first field I harvest 2/3 a bushel of grain/unit area; from the second, 1/2 bushel/unit area.
A collection of short pieces detailing how Euler solved a particular mathematics problem.
This is the title page of the 1599 edition of the Rechenbuch of Simon Jacob (d. 1564), a Rechenmeister of the sixteenth century. This was a commercial arithmetic text, in which the basic laws of arithmetic were applied to many practical problems.
Suppose a man had put out one cent at compound interest in 1620, what would have been the amount in 1824, allowing it to double once in 12 years?
Tartaglia's method for solving cubics, which he eventually explained to Cardano.
Two persons sat down to play for a certain sum of money; and agree that the first who gets three games shall be the winner. After a few games they resolve to divide the stakes. How much should each person receive?
Download the two winning essays to learn about using indivisibles to find the area under a cycloid arch in the 17th century and about the Radon transform and its use in x-ray tomography in the 20th century.
Given two circles tangent to each other and to a common line, determine a relationship between the radii and the distance between the tangent points.
Four episodes in the history of geometry are discussed, where dynamic geometry helps in understanding the ideas.