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DISCOVERY OF THE DAYAGES 7–9
Meet

Jamshid al-Kashi

Decimals & calculation

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.

Their story. Your next idea.

Al-Kashi worked on numerical calculation, including methods for finding roots. He helped develop the use of decimal fractions.

1001 Inventions, p. 87

decimala way to write numbers using place values based on ten
algorithman ordered set of steps for doing a task
YOUR TURN · 10 MINUTES

Build a pattern and explain it

Paper and large paper squares.

  1. Make a row with one square, then another with two, then another with three.
  2. Draw the next two rows before adding the squares.
  3. Count the total after each row and write the numbers in a table.
  4. Describe the rule in your own words. Ask someone to predict the next total.
Let’s wonder

When would a more precise measurement be useful?

My next question: __________________________________________________
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