4+
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Mobile
SDK by Qonversion.
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This app must be updated to iOS11. I purchased it and now it is not working.
Seems cool. Just downloaded will update in the future.
I love this app, but it does not work with iOS 11. PLEASE UPDATE!!!!
Using this app you will learn to do some multiplying of small numbers (till 12) without using the multiplication tables. This app presents only a part of the Trachtenberg system - a new way to do basic multiplication. The important benefits of this system are greater ease, greater speed, and greater accuracy.