About Abacus Lesson -ADD and SUB-
This is an app that you can learn addition and subtraction using an abacus. 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....
This is an app that you can learn addition and subtraction using an abacus.
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.
Jan 16, 2024
Version 3.1.9
updated library.
Previous Versions
Here you can find the changelog of Abacus Lesson -ADD and SUB- since it was posted on our website on 2021-12-18 00:17:42.
The latest version is 3.1.9 and it was updated on 2024-04-22 08:38:50. See below the changes in each version.
Abacus Lesson -ADD and SUB- version 3.1.9
Updated At: 2024-01-16
Changes: Jan 16, 2024
Version 3.1.9
updated library.
Abacus Lesson -ADD and SUB- version 3.1.5
Updated At: 2023-02-04
Changes: Feb 4, 2023
Version 3.1.5
All contents can be used free of charge in this application.
Update : Fixed minor bugs.
Abacus Lesson -ADD and SUB- version 3.1.0
Updated At: 2022-03-16
Changes: Mar 16, 2022 Version 3.1.0
All contents can be used free of charge in this application.
Added the feature to check the previous calculation when re-challenge the wrong problem.
Added the feature to set sound effect on/off. Abacus operation sound and other sound effects can be set individually.
Improved operability.
Abacus Lesson -ADD and SUB- version 2.0.9
Updated At: 2022-01-31
Changes: Jan 31, 2022 Version 2.0.9
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: Jan 17, 2022 Version 2.0.8
Fixed minor bugs.
Improved operability of the abacus.
Abacus Lesson -ADD and SUB- version 2.0.7
Updated At: 2021-12-21
Changes: Dec 21, 2021 Version 2.0.7
Added notifications about new app releases.
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: Nov 5, 2021 Version 2.0.5
Added introduction of Division Lesson App.
Fixed typo.
Disclaimer
Official App Store Link
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