Changes

Activities/Abacus (view source)

Revision as of 08:08, 3 April 2010

485 bytes removed , 08:08, 3 April 2010

Line 10: Line 10: −

[http://en.wikipedia.org/wiki/Abacus Abacus] lets the learner explore different representations of numbers using different mechanical counting systems developed by the ancient Romans and Chinese. There are several different variants available for exploration: a [http://en.wikipedia.org/wiki/Suanpan suanpan], the traditional Chinese abacus with 2 beads on top and 5 beads below; a [http://en.wikipedia.org/wiki/Soroban soroban], the traditional Japanese abacus with 1 bead on top and 4 beads below; ~~and~~ the [http://en.wikipedia.org/wiki/Abacus#Russian_abacus schety], the traditional Russian abacus, with 10 beads per column, with the exception of one column with just 4 beads used for counting in fourths.

+

[http://en.wikipedia.org/wiki/Abacus Abacus] lets the learner explore different representations of numbers using different mechanical counting systems developed by the ancient Romans and Chinese. There are several different variants available for exploration: a [http://en.wikipedia.org/wiki/Suanpan suanpan], the traditional Chinese abacus with 2 beads on top and 5 beads below; a [http://en.wikipedia.org/wiki/Soroban soroban], the traditional Japanese abacus with 1 bead on top and 4 beads below; the [http://en.wikipedia.org/wiki/Abacus#Russian_abacus schety], the traditional Russian abacus, with 10 beads per column, with the exception of one column with just 4 beads used for counting in fourths; and the [http://en.wikipedia.org/wiki/Abacus#Native_American_abaci Nepohualtzintzin], a Mayan abacus, 3 beads on top and 4 beads below (base 20).

Line 20: Line 20:

</gallery>

−

~~=== Coming soon ===~~

−

Nepohualtzintzin, a Mayan abacus based on 20. "The Nepohualtzintzin is divided in two main parts separated by a bar or intermediate cord. In the left part there are four beads, which in the first row have unitary values (1, 2, 3, and 4), and in the right side there are three beads with values of 5, 10, and 15 respectively. In order to know the value of the respective beads of the upper rows, it is enough to multiply by 20 (by each row), the value of the corresponding account in the first row. Altogether, there are 13 rows with 7 beads in each one, which makes up 91 beads in each Nepohualtzintzin."

[[Category:Activities]]

Walter

Bureaucrats, Administrators

10,579

edits