A ladder is placed perpendicular to the plane of the horizon, and in coincidence with the plane of an upright wall.

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A teacher agreed to teach 9 months for $562.50 and his board. At the end of the term, on account of two months absence caused by sickness, he received only $409.50. What was his board worth per month?

After completing this assignment on Simon Stevin's treatment of decimal fractions in his 1585 De Thiende, the author's preservice mathematics teachers understood why our usual procedure for multiplying such fractions works.

The Ohio Section Short Course will consider the use of original sources in teaching mathematics.

A superb collection of articles by experts on various areas of the history of analysis, from the Greeks to modern times.

A wooden beam is stood vertically against a wall. The length of the beam is 30 units.

Where does pi come from? Why should we be interested in negative numbers, or square roots of negative numbers? How did people ever figure out the quadratic formula? A truly wonderful reference for teachers at all levels.

Given a door and a measuring rod of unknown dimensions, the rod is used to measure the door.

In a right triangle, the hypotenuse is 9.434 and the sum of the sides around the right angle is 13. Find the lengths of the sides around the right angle.

The authors recount the 'great tale' of Napier's and Burgi's parallel development of logarithms and urge you to use it in class.