Abacus Lesson -ADD and SUB-

ADD and SUB using Abacus

Free · In‑App Purchases · Designed for iPad

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.

  • 4.9
    out of 5
    654 Ratings

updated library.

The developer, Hirokazu Komatsu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Location
    • Identifiers
    • Usage Data
    • Diagnostics
  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Identifiers
    • Usage Data
    • Diagnostics
  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

  • Seller
    • Hirokazu Komatsu
  • Size
    • 144.5 MB
  • Category
    • Education
  • Compatibility
    Requires iOS 11.0 or later.
    • iPhone
      Requires iOS 11.0 or later.
    • iPad
      Requires iPadOS 11.0 or later.
    • iPod touch
      Requires iOS 11.0 or later.
    • Mac
      Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
  • Languages
    • English and Japanese
  • Age Rating
    4+
  • In-App Purchases
    Yes
    • Donation Lv1 for hiding Ad $1.99
    • Donation Lv2 for hiding Ad $3.99
    • Donation Lv3 for hiding Ad $8.99
  • Copyright
    • © 2020 Hirokuma.App