Abacus Lesson
Abacus Lesson Summary
Abacus Lesson is a with in-app purchases Android app in Education by Hirokuma.App. Released in Dec 2021 (4 years ago). It has about 155.9K+ installs and 463 ratings with a 4.35★ (good) average. Based on AppGoblin estimates, it reaches roughly 2.6K monthly active users and generates around $<10K monthly revenue (100% IAP / 0% ads). Store metadata: updated Nov 7, 2025.
Recent activity: 427 installs this week (2.1K over 4 weeks) showing steady growth View trends →
Store info: Last updated on Google Play on Nov 7, 2025 .
4.35★
Ratings: 463
Screenshots
App Description
356+735+195, 23×89, 5626÷58, Can you solve each in 5 sec by mental arithmetic?
The goal of this app is to learn abacus and calculate these questions by mental arithmetic within 5 seconds.
All lessons of the abacus lesson series, which have been highly evaluated all over the world, are recorded. The lessons have been reworked in a more polite and easy-to-understand.
In addition, we have added unique training methods such as training focusing on finger movements and mental arithmetic training to improve mental arithmetic in order to learn abacus more efficiently.
And various improvements have been made.
- Either vertical screen or horizontal screen can be selected.
- The position and size of the abacus and window can be freely laid out.
- No ads.
- Added sound variations. Volume control can also be finely set.
- The color of the abacus can be set freely.
- Earn a trophy by achieving the goal.
- Smoother operability by optimizing the app.
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