What's New

This app has been updated by Apple to use the latest Apple signing certificate.

v.2.02 update: Bug fixes
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v.2.0 update: This is a major update and everything has changed! On the backend, the code has been entirely rewritten in Swift. All graphics, animations, interactions, and logic are also new. We hope you enjoy it!

App Description

A fun, simple, but challenging game for everyone to practice their addition and subtraction skills.


Newton learns what questions you answer incorrectly, and intelligently helps you get better at them. 

As you play, game features are unlocked to help you get better and track your progress over time, visualising how you’ve improved and highlighting your problem areas.


Choose from 3 different game modes: zen mode, speed mode, or time trial mode.


Other features include:
- External Bluetooth keyboard support

- Full GameCenter support and integration


- Sync your scores and progress across all your iOS devices

Compatible with iPhone 5 and above, or iPad devices running iOS10 and above.

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Newton - Add & Subtract subscriptions renew within 24 hours before the subscription period ends. There are 2 types of subscriptions, a weekly (7 days) and monthly (30 days) subscription. There is no free trial period. You will be charged through your iTunes account. You can manage, upgrade, downgrade, or cancel your subscription in iTunes Account Settings at any time.

Terms of Service: https://redu.us/terms.html
Privacy Policy: https://redu.us/privacy.html

iPhone Screenshots

(click to enlarge)

Newton - Add & Subtract screenshot 1 Newton - Add & Subtract screenshot 2 Newton - Add & Subtract screenshot 3 Newton - Add & Subtract screenshot 4 Newton - Add & Subtract screenshot 5

iPad Screenshots

(click to enlarge)

Newton - Add & Subtract screenshot 6 Newton - Add & Subtract screenshot 7 Newton - Add & Subtract screenshot 8 Newton - Add & Subtract screenshot 9 Newton - Add & Subtract screenshot 10

App Changes

  • April 27, 2015 Initial release
  • May 14, 2015 Price decrease: $0.99 -> FREE!
  • May 16, 2015 Price increase: FREE! -> $0.99
  • June 01, 2015 Price increase: $0.99 -> $1.99
  • June 04, 2015 Price decrease: $1.99 -> FREE!
  • June 05, 2015 Price increase: FREE! -> $1.99
  • June 15, 2019 New version 2.02
  • June 15, 2019 Price decrease: $1.99 -> FREE!
  • June 17, 2019 Price decrease: $1.99 -> FREE!