A sourcebook of original materials in the history of mathematics from ancient times to the early twentieth century.

Displaying 161 - 170 of 659

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.

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

Fibonacci gave a practical rule for approximating the area of an equilateral triangle.

Image of first arithmetic book published in the English colonies in what is now the Eastern United States

Thumbnail sketches of statisticians throughout history.

Two officers each have a company of men, the one has 40 less than the other.

A collection of illustrations of Inca quipus, with references to their earliest descriptions.

An old Chinese general led his army to a river with a steep bank. Standing atop the bank, he held a stick 6 feet long perpendicular to himself.

A number is required; that the square shall be equal to twice the cube.