If you are a student of a school that uses the materials of the Green Hat publishing house and you want to prepare for the 4th Green Hat National Championship of Mental Calculation, or if you simply want to train your skills in this area of ​​secondary education mathematics, this app will it's going to help a lot.

This is the official Green Hat app for training and participation in mental calculation competitions among hundreds of schools, where you can train thanks to a simulator that will help you practice as many times as you want so that, when the time comes for the competition, Be as prepared as possible.

The app includes four main options:

* Practice. It allows you to carry out all the practice sessions you want, presenting you with random operations, similar to those that will appear in the competition, which you must answer correctly.

* To compete. This option will only be available during the competition, but its operation is identical to the Practice option, with the difference that your time and qualification will be recorded.

* Advance. Once you have competed, this option will show you your results.

* Honor Roll. In this option you can see a list with the best results of the competition and, of course, the winners.