自分好みの難易度を作成可能なフラッシュ暗算アプリです
数の数、表示間隔、最大値、最小値を設定できます
暗算のトレーニング、老化防止にも是非ご活用ください
It is a Flash Mental Arithmetic app that make setting to suit your skill.
You can set Numbers, Interval, Max number and Min number.
Please take advantage of this app to mental arithmetic training or anti-aging.