Hundred Boxes description

Japanese style brain exercise!

100 calculation : Method of learning through repetition , which involves multiplying and other calculations carried out on a 10-by-10 grid of numbers.

In your some free time, enjoy 100 calculations.
Try it to improve your calculation skill, of for brain training, brain anti-aging, or killing time!
There are rankings for each calculation, so that you can compete with people all over the world!
Currently, this app is being implemented
Addition
Subtraction
Multiplication
Addition(2 digits)
Subtraction(2 digits)
Remainder

If there are some bugs or mistranslations in my app, please send me an e-mail.