More about this add-on

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 suanpan, the traditional Chinese abacus with 2 beads on top and 5 beads below; a soroban, the traditional Japanese abacus with 1 bead on top and 4 beads below; the 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 nepohualtzintzin, the traditional Mayan abacus, with 3 beads on top and 4 beads below (it uses base 20).

Image Gallery

What do you think?

Please log in to submit a review

Please do not post bug reports in reviews. We do not make your email address available to add-on developers and they may need to contact you to help resolve your issue.

Review Guidelines

Detailed Review

Release Notes

Version 59 — March 4, 2016 — 281 KB

59

* New translations
* Added repository to activity.info