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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.
Three circles of varying radius are mutually tangent. The area of the triangle connecting their centers is given. Find the radius of the third circle.
There is a round town 8000 feet in circumference.
A man went to a draper and bought a length of cloth 35 braccia long to make a suit of clothes.
History of Maya calendars, including the modified base 20 number system used in them
Poster picturing five famous women, from Hypatia to Grace Hopper.
The cost per hour of running a certain steamboat is proportional to the cube of its velocity in still water. At what speed should it be run to make a trip up stream against a four-mile current most economically?
This is from a letter of June, 1695 in which Leibniz is discussing differentiation with Johann Bernoulli. The work in which these letters appear is the Virorum Celeberr. Got. Gul. Leibnitii et Johann Bernoulli Commercium Philosophicum et Mathematica, originally published in 1740.
Why should we use historical problems in today's classroom? This article answers that question and serves as an introduction to the problems on this website.
This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.

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