# 11x13 — Calculation training

> Daily arithmetic training app for improving math familiarity and skills. (iPhone/iPad app by Matthias Hennemeyer.)

- Source: https://appshunter.io/ios/app/11x13/id1345978316 (this page in markdown: same URL + `.md`)
- Developer: [Matthias Hennemeyer](https://appshunter.io/developer/352918135)
- Category: Education, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 10 MB
- Languages: American English
- Released: 2018-10-21
- Data updated: 2026-06-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/11x13/id1345978316/reviews.md

## What is 11x13?

11x13 is not about Learning, but a straight Training-App.
Open the app and start exercising.
Just 10 minutes of daily practicing will expand your familiarity with numbers and will help to overcome reservation regarding Math.

The basic arithmetic operations constitute the foundation of further mathematical skills. Problems in this area will show up anywhere else. And, vice versa, if one encounters difficulties understanding seemingly simple mathematical principles, odds are that there is some very basic practicing needed.

Charts and grids make your progress visible.
The personal level for each calculation method, marked by a star symbol, is continuously computed from the rating of the current exercise and the time you need to find the answer. The sum of the four levels, shown on top of the main screen, forms your score, which can be uploaded to a leaderboard by enabling Game Center.
 
Additionally, there are  20x20-Grids that show the number range up to 20+20, 20x20 and so on.

I appreciate your Feedback. Feel free to drop me a line at  mhennemeyer@me.com

Kind regards
Matthias Hennemeyer

## Key features

- Daily math practice
- Basic arithmetic operations
- Progress visualization
- Personalized calculation levels
- Leaderboard integration
- Number range grids

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/11x13/id1345978316/reviews.md

### 4/5 — Sehr gute App

*2020-09-06, version 1.0*

Eine Option zum Pausieren wäre schön.

### 5/5 — Klasse und für lau! Danke

*2020-03-10, version 1.0*

Prima

## Frequently asked questions about 11x13

### What is the main focus of 11x13?

11x13 is a training app focused on daily practice of basic arithmetic operations to improve familiarity with numbers and overcome math reservations. It emphasizes consistent exercise rather than traditional learning methods.

### How does 11x13 track progress?

Progress is made visible through charts and grids. A personal level for each calculation method is computed based on exercise ratings and answer times, contributing to an overall score displayed on the main screen.

### Can I compete with others using 11x13?

Yes, your score can be uploaded to a leaderboard by enabling Game Center. This allows for comparison with other users and adds a competitive element to your practice.

### What kind of number ranges does 11x13 cover?

The app includes 20x20-Grids that display number ranges up to 20+20, 20x20, and similar scales, providing practice with various numerical complexities.

### Is 11x13 suitable for young children?

With an age rating of 4+, 11x13 is designed to be accessible for younger users to build foundational math skills. Its focus on basic operations makes it appropriate for early mathematical development.

### How often is 11x13 updated?

The app was last updated on October 21, 2018, with version 1.0. As of the provided data, there have been no subsequent updates.

### Does 11x13 have ads?

No, 11x13 does not contain advertisements. It is a completely ad-free application.

### What devices is 11x13 available on?

11x13 is available for iPhone and iPod devices. It is designed to run on Apple's mobile operating system.

## Version history (last 1 release)

### 1.0 — 2018-10-21

No release notes.

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## More apps by Matthias Hennemeyer

- [iKanban](https://appshunter.io/ios/app/ikanban/id352918132)
- [RemindersTags](https://appshunter.io/ios/app/reminderstags/id1491987173)

All apps by Matthias Hennemeyer: https://appshunter.io/developer/352918135

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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 2026-06-25.*