What's New

Bugfixes.

App Description

Introducing the new generation of math learning apps powered by handwritten digit recognition. Handwritten input is the most natural for children, no more multiple choice questions or distraction through keyboard input. With our apps kids can better focus on tasks and get a chance to improve their handwriting.

This app was designed to help children to practice and improve their skills in adding and subtracting numbers up to 20.

iPhone Screenshots

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Add and subtract within 20 screenshot 1 Add and subtract within 20 screenshot 2 Add and subtract within 20 screenshot 3 Add and subtract within 20 screenshot 4 Add and subtract within 20 screenshot 5

iPad Screenshots

(click to enlarge)

Add and subtract within 20 screenshot 6 Add and subtract within 20 screenshot 7 Add and subtract within 20 screenshot 8 Add and subtract within 20 screenshot 9 Add and subtract within 20 screenshot 10

App Changes

  • December 10, 2013 Initial release
  • December 19, 2013 New version 1.0.1
  • December 28, 2013 Price decrease: $0.99 -> FREE!
  • December 31, 2013 Price increase: FREE! -> $0.99
  • April 07, 2014 Price decrease: $0.99 -> FREE!
  • April 09, 2014 Price increase: FREE! -> $0.99
  • August 01, 2014 Price decrease: $0.99 -> FREE!
  • August 02, 2014 Price increase: FREE! -> $0.99
  • June 21, 2016 Price increase: $0.99 -> $1.99
  • August 13, 2016 Price decrease: $1.99 -> $0.99
  • August 19, 2016 Price increase: $0.99 -> $1.99
  • December 20, 2016 Price decrease: $1.99 -> $0.99
  • January 01, 2017 Price increase: $0.99 -> $1.99
  • June 13, 2019 New version 3.1.0
  • January 13, 2020 New version 4.0.1
  • January 13, 2020 Price decrease: $1.99 -> FREE!
  • January 28, 2020 Price increase: FREE! -> $1.99
  • July 14, 2020 New version 4.0.2
  • May 06, 2021 Price decrease: $1.99 -> $0.99
  • August 05, 2021 Price increase: $0.99 -> $2.99