SumXMinus – Negative Math
Katsuhiko Yao Education iPhoneiPadiPod touch
SumXMinus – Negative Math is a free Education app for iPhone and iPad by Katsuhiko Yao. Requires iOS 16.0. Updated June 23, 2026.
- Price
- Free
- on the App Store
- Size
- 32 MB
- Age 4+
- Updated
- Jun 23
- 2026 · v2.1.1
Screenshots
About SumXMinus – Negative Math
Created by a Math Teacher Train your brain in just 30 seconds. QuickMath Series A fast and fun way to master mental math. Can you find the right number pairs? Use both positive and negative numbers to reach the target. Example: (-2) + (-4) = -6 (-4) + (+5) = 1 Challenge yourself and improve: • Negative number understanding • Mental calculation speed • Focus and thinking skills From upper elementary to middle school level. QuickMath Series • SumX – Number Pair Puzzle • SumXMinus – Negative Number Training • Common Divisor – Divisor Brain Training • Exponent – Power Calculation Challenge • Decimal Finder – Number Line Intuition
What’s new
Version 2.1.1 · Updated June 23, 2026
Improved the Result View layout on certain tablet devices, including the iPad Air 11-inch. * Fixed layout issues on the result screen * Improved visibility of scores and buttons * Enhanced overall user experience
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
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
Used for: Third-Party Advertising, App Functionality
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Usage Data: Product Interaction
- Diagnostics: Crash Data
Used for: Analytics
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| SumXMinus – Negative Math | – | Free | June 23, 2026 | |
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