11x13 is made and published by Matthias Hennemeyer. AppBrain is an independent app data site and isn't affiliated with Matthias Hennemeyer. The app name, icon, screenshots and description belong to Matthias Hennemeyer and are shown as published on the App Store.
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- Last updated
- October 11, 2026
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Releases
Updates seen on the App Store- Version
- 1.5
- Launched
- October 2018
No changelog data
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Technology
Found in the app by AppBrain- Price
- Free
- App size
- 3.26 MB
- Content rating
- Everyone
Technologies used by 11x13
About the app and developer
About 11x13
11x13 is an education app developed by Matthias Hennemeyer.
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App Information
11x13 is freely available from the App Store. The app size is 3.26 MB. The latest version available is 1.5. The last update was on October 11, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since October 2018.
Developer information for Matthias Hennemeyer
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Store listing
By Matthias Hennemeyer, from the App Store
Description by Matthias Hennemeyer Written by the developer, not by AppBrain. Click to read.
THE BASIC OPERATIONS ARE FREE. NOW AND FOREVER.
Addition, subtraction, multiplication and division with level bands that grow with you: from small times tables over carrying to the 11–19 tables — the app's namesake — plus chained problems like 47 + 8 + 6 at high levels.
WITH “EVERYTHING” YOU PRACTICE EVERY OPERATION.
Unlock every package permanently with a one-time purchase or for the duration of a subscription. The 14-day app trial ends automatically without starting a subscription:
• Percentages: from 50% of round numbers to surcharge and discount
• Roots: squares and cube roots
• Powers: up to powers of two and ten
• Derivatives and integrals: from monomials to binomials
• Geometry: symbol equations (▲ + ▲ = 12), counting corners, matching shapes
• Fractions: adding like fractions, simplifying, unlike denominators, multiplying
Your progress grows per operation, syncs via iCloud, with progress charts and a Game Center leaderboard.
Easy to keep at it: a daily practice reminder at the time you choose, a Home Screen widget with the problem of the day, and statistics with streak, week-over-week comparison and band history.
With a true iPad layout and hardware keyboard support (keys 1–9).
Subscriptions renew automatically until cancelled in App Store subscriptions. A one-time purchase provides permanent access.
Mistake notebook: The last 100 tasks you answered incorrectly are saved on this device. Review up to ten tasks without time pressure. A task leaves the notebook after a correct first answer in two separate rounds.
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/