# CommonDivisor — Master Simplifying Fractions

> Master Simplifying Fractions (iPhone/iPad app by Katsuhiko Yao.)

- Source: https://appshunter.io/ios/app/commondivisor/id6746661138 (this page in markdown: same URL + `.md`)
- Developer: [Katsuhiko Yao](https://appshunter.io/developer/1543188534)
- Category: Education, Games
- Price: Free
- Age rating: 4+
- Requires: iOS 16.6 · 19 MB
- Languages: American English, French (France), Japanese
- Released: 2025-06-02
- Data updated: 2026-07-19
- User reviews in markdown: https://appshunter.io/ios/app/commondivisor/id6746661138/reviews.md

## What is CommonDivisor?

A simple math game for kids who struggle with reducing fractions.

Find common divisors among 9 numbers and keep dividing.
The rules are easy, but the learning is deep.
Players naturally understand why fractions can be simplified.

• Build intuition for common divisors
• Improve fraction skills through repetition
• Learn by playing, not memorizing

Perfect for home practice, classrooms, and family play.


## Version history (last 5 releases)

### 5.2.0 — 2026-07-17

* Improved the sharing experience.
* The app now opens the ranking screen after sharing.
* Improved the stability of the ranking registration process.

### 5.1.0 — 2026-07-07

* Fixed an issue where the result screen did not appear.
* Improved overall stability.

### 5.0.0 — 2026-07-04

New
・Added the Miles feature.
・Added a Terms of Use & Community Guidelines agreement shown on first launch.
Improvements
・Improved the rules to provide a fairer and safer ranking experience.
・Prepared the app for future feature enhancements.

### 4.6.2 — 2026-07-04

• Improved Firebase Analytics integration.
• Enhanced internal tracking for more accurate app usage analytics.
• Fixed minor issues and improved overall stability.

### 4.6.1 — 2026-06-19

Improved the reliability of the version checking feature.
Fixed minor bugs and improved stability.

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## More apps by Katsuhiko Yao

- [QuickAge](https://appshunter.io/ios/app/quickage/id1545922757)
- [QuickCheck3](https://appshunter.io/ios/app/quickcheck3/id1566831890)
- [AddToMinusX](https://appshunter.io/ios/app/addtominusx/id6443640661)
- [Multiply Pairs – Mental Math](https://appshunter.io/ios/app/multiply-pairs-mental-math/id6448858474)
- [Power of 2](https://appshunter.io/ios/app/power-of-2/id6450391335)
- [Neg Multiply – Brain Training](https://appshunter.io/ios/app/neg-multiply-brain-training/id6450744705)

All apps by Katsuhiko Yao: https://appshunter.io/developer/1543188534

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-19.*