What's New

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

App Description

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!

iPad Screenshots

(click to enlarge)

Lehrer Lämpel: Fractions screenshot 1 Lehrer Lämpel: Fractions screenshot 2 Lehrer Lämpel: Fractions screenshot 3 Lehrer Lämpel: Fractions screenshot 4 Lehrer Lämpel: Fractions screenshot 5

App Changes

  • November 21, 2014 Initial release
  • May 21, 2015 Price increase: $0.99 -> $1.99
  • November 14, 2015 New version 1.1
  • November 05, 2016 Price decrease: $1.99 -> $0.99
  • June 13, 2019 New version 1.2
  • November 26, 2019 New version 1.3
  • July 14, 2020 New version 1.4

Other Apps From Claus Zinn

Lehrer Lämpel: Number Pyramids Lehrer Lämpel: Subtraction Lehrer Lämpel: Addition Lehrer Lämpel: Digit Squares Lehrer Lämpel: Number Wheels Lehrer Lämpel: Division Lehrer Lämpel: Multiplication Lehrer Lämpel: Blob Tasks BSL: Wortformerkennung