# Lehrer Lämpel: Fractions — Addition & Subtraction

> Addition & Subtraction (iPhone/iPad app by Claus Zinn.)

- Source: https://appshunter.io/ios/app/lehrer-lampel-fractions/id932955952 (this page in markdown: same URL + `.md`)
- Developer: [Claus Zinn](https://appshunter.io/developer/889016868)
- Category: Education, Games
- Price: $0.99
- Age rating: 4+
- Requires: iOS 9.3 · 7 MB
- Languages: American English, French (France), German (Germany)
- Released: 2014-11-19
- Data updated: 2026-05-16
- User reviews in markdown: https://appshunter.io/ios/app/lehrer-lampel-fractions/id932955952/reviews.md

## What is Lehrer Lämpel?

Lehrer Lämpel is an educational app that supports school children (usually 5rd grade) to practise their fraction addition and subtraction skills.

The app is built-upon a state-of-the-art algorithm for diagnosing all student action and for providing targeted, situation-adaptive help.

Pupils can ask Lehrer Lämpel for help at any time. A hint mechanism guides learners towards the next step, or points them to the source of the error.

The app offers fractions with numbers that involve 1 or 2 digits. 

Lehrer Laempel supports two methods for combining fractions: "the least common multiple", or "any multiple".

Optionally, a voice-over is available (male and female voice in English and French; female voice for German) that reads-aloud all help.

Supports self-defined fraction addition/subtraction tasks and there is a work-sheet, and randomised exercises.

Supports English, French and German.

Available on the iPad, for iOS9 or later. 

The app is ad-free. No data is being collected. Please consider leaving a review. This helps a lot. Thanks!


## Version history (last 5 releases)

### 1.5 — 2024-06-17

Maintenance update.

### 1.4 — 2020-06-05

- The worksheet now keeps track of the number of help requests the user issued to solve a task.
- Minor design improvements.

### 1.3 — 2019-11-22

- Improved English feedback 
- Improved feedback (red/green-colored cells)
- Minor design improvements
- More exercises

### 1.2 — 2019-01-10

Improved wording of tutorial feedback.
Fixed bug where it was possible to get a result in the negative numbers without having a minus sign to express it.
Minor improvements.

### 1.1 — 2015-11-13

Supports now iOS9. Fixes previous incompatibilities.
Now supports retina displays.
Minor design improvements

## Apps similar to Lehrer Lämpel

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Math Kobold - Learning Game](https://appshunter.io/ios/app/math-kobold-learning-game/id1536143642) | — | $3.99 | Education |
| [ClaroSpeak Plus](https://appshunter.io/ios/app/clarospeak-plus/id845128025) | 3.3 (8) | $9.99 | Education |
| [(AR) Number Line](https://appshunter.io/ios/app/ar-number-line/id6473689075) | — | $1.99 | Education |
| [Fraction Calculator 4in1](https://appshunter.io/ios/app/fraction-calculator-4in1/id638829648) | 5.0 (6) | $9.99 | Education |
| [4th Grade Math - Math Galaxy](https://appshunter.io/ios/app/4th-grade-math-math-galaxy/id911949523) | 1.0 (1) | Free | Education |
| [Geometric Transformations](https://appshunter.io/ios/app/geometric-transformations/id1513980066) | 1.0 (1) | $1.99 | Education |

## More apps by Claus Zinn

- [Lehrer Lämpel: Number Pyramids](https://appshunter.io/ios/app/lehrer-lampel-number-pyramids/id889016865)
- [Lehrer Lämpel: Subtraction](https://appshunter.io/ios/app/lehrer-lampel-subtraction/id890390632)
- [Lehrer Lämpel: Addition](https://appshunter.io/ios/app/lehrer-lampel-addition/id920522698)
- [Lehrer Lämpel: Digit Squares](https://appshunter.io/ios/app/lehrer-lampel-digit-squares/id948600535)
- [Lehrer Lämpel: Number Wheels](https://appshunter.io/ios/app/lehrer-lampel-number-wheels/id959272416)

All apps by Claus Zinn: https://appshunter.io/developer/889016868

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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 2026-05-16.*