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19x19まで暗算でスラスラ app for iPhone and iPad


4.6 ( 5936 ratings )
Reference Education
Developer: Canalier
0.99 USD
Current version: 1.1, last update: 6 years ago
First release : 02 Sep 2014
App size: 22.25 Mb

This is for learning and practicing mental arithmetic from 11x11 to 19x19 in a easy way.
If you are not doing mental arithmetic habitually, dont worry. This is an easy method of only 1 pattern, which you will get used to soon, and can make it fluently.
With only 3 problems to answer for 1 practice, you can launch it anytime.
Its not only for children and students, but also for businessmen or elderly persons for brain workout.