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The number 50 is divided by a certain number. If the divisor is increased by 3, the quotient decreases by 3.75. What is the number?
This book explores the history of mathematics from the perspective of the creative tension between common sense and the "impossible" as the author follows the discovery or invention of new concepts that have marked mathematical progress.

Page 7, Who's That Mathematician: Images from the Paul R. Halmos Photograph Collection: Blackwell, Halmos, Boas, Bollobas, Bombieri, Mumford, Bonsall, Rankin
A new edition of a brief history text, arranged topically rather than chronologically.
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
This is a page from the Rechenbuch of Adam Riese. It deals with the measurement of barrels. Also a page that has a table showing numbers both in German words, in Roman numerals, and in the Hindu-Arabic numerals.
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.
A ladder has 100 steps. On the first step sits 1 pigeon; on the second, 2; on the third, 3; and so on up to the hundredth. How many pigeons in all?

Curve sketching, tangent lines, and optimization, explored via interactive applets

A translation of part of a thirteenth century work by the Byzantine monk Maximus Planudes on the Hindu-Arabic numerals and the algorithms for calculation.