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Developed by Dr Claus Zinn

Computer Scientist and Educational Researcher



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Lehrer Lämpel

Version 1.3
Lehrer Lämpel: Multi-Column Subtraction
DEUTSCH

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An educational app that supports primary school kids to train their subtraction skills.
  • Practising multi-column subtraction
  • Supports two main subtraction methods:
    • The Decomposition Method
    • The Equal Addition (= Austrian Method)
  • Various levels of difficulty
    • from 2 to 5 digit numbers
    • with and without borrowing
  • Worksheet with 3-digit number subtraction tasks
  • Unlimited number of (randomised) exercises
  • Support for self-defined subtraction tasks
  • Direct feedback for correct/incorrect steps
  • Intelligent next-step help and error correction
  • Multi-lingual help page (english, german, french)
  • Available for iPad tablets, from iOS7
  • Price: .99 USD, 1.09 Euro
Requirements:
Compatible with the iPad. Requires iOS7 or later. No WiFi, Edge, or 3G network connection required. No ads.

About

Lehrer Lämpel is an educational app that supports primary school children (usally 3rd grade) to practise their multi-column subtraction skills.

The two main subtraction methods, namely, the Equal Additions Method (aka the Austrian Method), and the Decomposition Method are supported.

Easy drag & drop of numbers to the blackboard.

Immediate feedback option where incorrect steps are immediately marked red and where correct steps are immediately marked green.

Pupils can ask Lehrer Lämpel for help at any time. Help first removes an erroneously learner step; if there are no errors, a single step is performed towards the solution.

All teacher steps towards the solution are followed-up with a step explanation as well.

Various degrees of difficulty guided by the number of digits the two numbers can have, and whether borrowing operations are required.

Supports self-defined subtraction tasks and there is a work-sheet, and randomised exercises

Supports English, French and German.

Available on the iPad, for iOS7 or later.

Updates

Version 1.0

Released on August 12th, 2014
  • Initial Release.

Version 1.1

Erstellt am 25 November 2014
  • Added new verbalisation option (additive speaking)
  • Minor design changes and bug fixes

Version 1.2

Released on November 6th, 2015
  • Added support for iOS9.
  • Improved design
  • Voice Synthesis to read aloud help!

Version 1.3

Released on Feburary 24th, 2017
  • The swish and fanfare sound are no longer played as system sounds, that is, they can now be switched off or their volume turned down.
  • Minor App Icon Redesign

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Privacy Policy

Our privacy policy is rather simple. We do not collect any information from you and your child when using our app or browsing our website.

You or your child will never be prompted to provide any sort of information in our app. You are free to use the contact form on the website mathdistrict.com to give us your feedback, ask questions, elicit new app features, or file a bug report. For this, you can equally contact us at support@mathdistrict.com.

We will use your contact information only for being able to reply to your requests. It will not be shared with anybody else.

Our app is solely financed by its price tag, there are no in-app purchases, and the app is ads-free.

Contact

Contact Us

Please use the following form for questions, feedback, feature requests etc.

Our email: support@mathdistrict.com

Postal Address

Dr. Claus Zinn, Diplom-Informatiker (Univ.)
In der Gebhardsoesch 33
78467 Konstanz, Germany