CommonDivisor
Katsuhiko Yao Education iPhoneiPadiPod touch
CommonDivisor is a free Education app for iPhone and iPad by Katsuhiko Yao. Requires iOS 16.6. Updated September 13, 2026.
- Price
- Free
- on the App Store
- Size
- 19 MB
- Age 4+
- Updated
- Sep 13
- 2026 · v5.3.0
Screenshots
About 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.
What’s new
Version 5.3.0 · Updated September 13, 2026
Added a new training mode: “Multiples of 3 up to 30 (times-table range).” This makes it easier to practice recognizing multiples of 3 within the basic multiplication range.
Play today's Queens puzzle
One queen in every row, column and color. A free daily puzzle from Fiplay, same board for everyone. It plays right here, no download.
App privacy
The developer, Katsuhiko Yao, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location: Coarse Location
- Identifiers: Device ID
- Usage Data: Product Interaction, Advertising Data
- Diagnostics: Crash Data, Performance Data
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Location: Coarse Location
- Identifiers: Device ID
- Usage Data: Product Interaction, Advertising Data
- Diagnostics: Crash Data, Performance Data
Used for: Third-Party Advertising
Alternatives to CommonDivisor
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