This will be the fifth meeting of this kind, which brings together mathematics educators and researchers to share their teaching ideas and classroom experience in teaching mathematics based on historical, epistemological and cultural approaches.

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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.

We invite you to send us information about these photographs of 20th century mathematicians.

You have two sums of money, the difference of which is 2 dirhams; you divide the smaller sum by the larger and the quotient is equal to 1/2. What are the two sums of money?

On Triangles, by Regiomontanus (Johannes M�ller) (1436-1476), written in 1464 but not published until 1533.

There is a number which when divided by 2, or 3, or 4, or 5, or 6 always has a remainder of 1 and is truly divisible by 7. It is sought what is the number?

A discussion of aspects of Leonardo of Pisa's Book of Squares.

On an expedition to seize his enemy's elephants, a king marched 2 yojanas the first day.

A series of circles have their centers on an equilateral hyperbola and pass through its center. Show that their envelope is a lemniscate.

Given two circle tangent at the point P with parallel diameters AB, CD, prove that APD and BPC are straight lines.