Trachtenberg system

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly.

Excerpt from the Wikipedia article “Trachtenberg system”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Holretz, CC BY-SA 4.0, via Wikimedia Commons.