Jamshīd al-Kāshī

Also found as Kashi

Al-Kashi worked on numerical calculation, including methods for finding roots.

Make a bedtime story Listen & discover

Image used in the research archive for Jamshīd al-Kāshī — Image used by the research archive for Jamshīd al-Kāshī. Historical illustrations are later interpretations, not verified likenesses. View image source

MADE TO KEEP & SHARE

Posters

Loading posters…

Finding smaller pieces of a number

Ages 7–9

Al-Kashi worked on numerical calculation, including methods for finding roots.

He helped develop the use of decimal fractions.

His work used decimal fractions to approximate numbers, including pi.

Al-Kashi gave an algorithm for calculating nth roots: a sequence of steps for finding a numerical result.

PAUSE & WONDER

When would a more precise measurement be useful?

Try an activity

Find Jamshid al-Kashi in our books

Use the printed page in a physical book, or the PDF page in your copy. Open a reference for the surrounding text.

1001 Inventions

Edited by Salim T. S. al-Hassani

2 reading locations

Printed p. 87 PDF p. 90Reading page

“…on the decimal system. In the 14th century, Al-Kashi contributed to the development of decimal fractions, not only for approximating algebraic numbers, but also for real numbers such as pi. His contribution to…”

Text around a matching name in the supplied edition. Extraction may retain spelling or spacing errors.

Printed p. 315 PDF p. 318Biographical entry

“…Al-Fakhri. Al-Kashghari, Mahmud (1073); Turkey; geographer and lexicographer. Al-Kashi, Ghi yat al-Din (1380- 1429); Kashan, Iran; mathematician and astronomer. Johannes Kepler (1571-1630); near Stuttgart, Germany; mathematician and astronomer . Al-Khujandi, Abu Mahmud Hamid…”

Text around a matching name in the supplied edition. Extraction may retain spelling or spacing errors.

FROM THE RESEARCH ARCHIVE

Follow the research

High-precision calculations of π and sin 1°, numerical methods, astronomical tables, and work on the law of cosines.

This summary comes from the collected Islamic Scientific Heritage posts. It has not been independently verified in full. A book name match alone does not confirm every claim in a post.

Research note: Specific priority claims are preserved in the source posts, not treated as verified here.

28 original research posts

A new pioneer, in your inbox.

A thoughtful read for grown-ups. Ideas to bring home to your family.

Choose your pace