"Calc In Head" is a game of calculation, made in Japan. The most outstanding characteristic of this game is the "multiple-choice-style quiz"; it is distinguishing this app from the other games in the same category.
The purpose of the game is to encourage the game player to develop the skills of calculations with high accuracy and agility. If you feel the ordinal calculation drills are not appropriate for your need because they are the practices of number writing (or numeric keys tapping), perhaps this game would satisfy your need. Actually this app "Calc In Head" is developed to satisfy a personal need of a doctor (in software engineering region) who couldnt find any calculation drill worthy of spending time for his daughter.
As you may know, some Asian cultures have recognized the importance of calculation in head, that is called "anzan" in Japanese (anzan = mental abacus, Wikipedia says). The anzan skill is not so useful by itself, but it is essential to solve the mathematical problem in higher layer; you have to complete a fundamental arithmetic calculation in a second or two with 100% accuracy.
In this app "Calc In Head", you dont need to operate a numeric-pad to enter the answer, because we think it is a waste of time. You just need to calculate the quizzes in your head and select the right answer from the displayed 4 options.
In addition to the distinguish feature "multiple-choice-style quiz", this application would provide the following characteristics:
(1) well designed courses,
(2) motivating both accuracy and agility,
(3) relaxing background music,
(4) attractive photos on background.
Enjoy to get smarter.