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The sum of the two digits of a 2-digit number is 9. If 45 is subtracted from the number, the result will be expressed by the digits in reverse order. Find the number.

Multicultural Classroom Posters Sets 3 & 4

These posters illustrate aspects of the history of mathematics in countries from Babylonia to Ireland.

Silver and Gold

There are two piles, one containing 9 gold coins, the other 11 silver coins.

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.