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Hirokazu Komatsu
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".
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來源：Apple 公開 App Store 頁面 · 僅包含公開可見項目
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.
In the app, we will explain simple and fast method of the multiplication using the abacus.
To learn multiplication, it is essential to be able to add with an abacus.
If you are new to addition and subtraction, we recommend that You first learn with the following app.
https://apps.apple.com/us/app/abacus-lesson-add-sub/id1526785916
This app will give you the skill of calculation of multiplication.
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最新觀測到的下載價格為 免費。請開啟 App Store 官方連結確認目前結帳價格。
Apple 公開頁面目前在此商店顯示 0 個購買項目，公開清單可能不完整。
