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My age is a number consisting of two digits, 1/2 of this number is a mean proportional between these two digits, and two years hence, my age will be a third proportional to the same two digits, directly as they stand in my present age.
Having been given the lengths, a and b, of two straight lines drawn from the acute angles of a right triangle to the middle of the opposite sides, determine the length of those sides.
This is an invited working conference as part of the ICMI Study Series.
Classrom suggestions for integrating Leonardo's ideas in several different classes

Nine examples of using history in the mathematics classroom -- for those who read French!

Two men starting from the same point begin walking in different directions. Their rates of travel are in the ratio 7:3.
A leech invited a slug for a lunch a leuca away.
A collection of original texts to help students learn some important areas of mathematics.
There are four companies, in one of which there are 6 men, in another 8, and in each of the remaining two, 9 men. How many ways can a committee of 4 men be composed by choosing one man from each company?
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