famous numbers:
Think of well-known and important numbers for us, and write a sticky about it.
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the abacus:
The abacus is a calculating instrument that uses beads that slide along a series of wires or rods set in a frame to represent the decimal places. Probably of Babylonian origin, it is the ancestor of the modern digital calculator. Used by merchants in the Middle Ages throughout Europe and the Arabic world, it was gradually replaced by arithmetic based on Hindu-Arabic numerals. Though rarely used in Europe past the 18th century, it is still used in the Middle East, China and Japan.
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Here is an elementary handout for working with one of the simplest abacuses, the soroban:
abacus_worksheet.docx | |
File Size: | 259 kb |
File Type: | docx |
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Here is an Abacus Handbook.
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