About Abacus Lesson - ADD and SUB -
An abacus is named "Soroban" in Japan. Do you know what an abacus is? The abacus is very simple calculator used in China, Japan, Korea and so on. Some people may say "Isn't it an unnecessary tool if you have a calculator...
An abacus is named "Soroban" in Japan. Do you know what an abacus is? The abacus is very simple calculator used in China, Japan, Korea and so on. Some people may say "Isn't it an unnecessary tool if you have a calculator such as a smartphone?". Answer would be "No".
The biggest difference between electric calculators and the abacus is whether you need to hold it in your hand when calculating. Because of its simplicity, you will be able to easily use the abacus in your mind.
Imagine that you can use calculations of about 3 digits in your life without physical tools.
This app will give you the skill of calculation.
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Previous Versions
Here you can find the changelog of Abacus Lesson - ADD and SUB - since it was posted on our website on 2021-12-11 20:26:53.
The latest version is 3.1.9 and it was updated on 2024-04-22 15:36:13. See below the changes in each version.
Abacus Lesson - ADD and SUB - version 3.1.9
Updated At: 2024-01-17
Changes: Updated Library.
Ended support for devices below Android 7.0
Abacus Lesson - ADD and SUB - version 3.1.7
Updated At: 2023-08-21
Changes: Updated target API level to 33.
Abacus Lesson - ADD and SUB - version 3.1.6
Updated At: 2023-07-07
Changes: Updated libraries
Abacus Lesson - ADD and SUB - version 3.1.5
Updated At: 2023-02-02
Changes: fixed minor bug.
Abacus Lesson - ADD and SUB - version 3.1.0
Updated At: 2022-03-16
Changes: All contents can be used free of charge in this application.
Added the feature to set sound effect on/off. Abacus operation sound and other sound effects can be set individually.
Abacus Lesson - ADD and SUB - version 2.0.9
Updated At: 2022-01-31
Changes: All content is free for this application, but since there was a request to remove advertisements, we added a feature to delete advertisements by purchasing as donate.
Abacus Lesson - ADD and SUB - version 2.0.8
Updated At: 2022-01-17
Changes: Fixed minor bugs.
Improved operability of the abacus
Abacus Lesson - ADD and SUB - version 2.0.7
Updated At: 2021-12-20
Changes: Fixed an issue that beads would make a sound with just a touch.
Abacus Lesson - ADD and SUB - version 2.0.5
Updated At: 2021-11-05
Changes: added introduction of division lesson app.
fixed typo.
Disclaimer
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