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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.

Asking a Woman Her Age

A lady being asked how old she was at the time of her marriage replied that the age of her oldest son was 13; that he was born 2 years after her marriage...

Storm's a' Brewin'

What is the perpendicular height of a cloud when its angles of elevation were 35 degrees and 64 degrees as taken by two observers?

History of Mathematics - Mesopotamia to Modernity

A new history of mathematics text which asks lots of questions about the history and the mathematics.

Sums of Powers of Positive Integers

A history of attempts to develop formulas expressing the sums of powers of the first n positive integers from the Pythagoreans to Jakob Bernoulli. With exercises.

Teaching Leonardo: An Integrated Approach

The work of the great Renaissance artist/scientist Leonardo da Vinci can be taught in secondary schools through an integrated approach of several disciplines. This article explores the approach of the Ross School.

Area of an Equilateral Triangle

Suppose the area of an equilateral triangle be 600. The sides are required.

A Swarm of Bees

The square root of half the number of bees in a swarm has flown out upon a jessamine bush; 8/9 of the swarm has remained behind.

Pioneers in Mathematics

A five-volume set of biographies of mathematicians from ancient times to the twentieth century, aimed at secondary students.

X Marks The Spot

What is the value of X...