KoAbacus - Mental Arithmetic

aboard

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About this app

KoAbacus 1.0.53 - Korean Abacus & Mental Arithmetic

The abacus is a calculating tool that was in use centuries before the adoption of the written modern numeral system and is still widely used by merchants, traders and clerks in Asia, Africa, and elsewhere.

* button function
6,5,4,3,2,1 : - positional number
+ , - , x , / : the four arithmetical operation & new number genernation
9, 8, 7, 6, 5 : bounds
stat & end : result

* Menu Button
- Auto Test : Count, Delay
- Speech : Start, End, +, -, *, /
- Sound : Click Sound

* Start Button LongClick - Abcus Clear
* Menu Button LongClick - Volume Control (4.0 ~)
* [-] [x] [/] button LongClick - Auto Mental Arithnmetic

Ratings and reviews

Great for addition. Continuous subtraction srarts from zero, so it's rather useless.

Good and best 🌷🌷🌷💐💐💐💐💐💐😺😺😺😺

best app😄🤗

What’s new

Abacus , Mental Arithmetic