The “Mental Arithmetic" is a dynamic math workout with very flexible settings and detailed statistics. It will be useful for both adults and children because mental math is a great brain workout at any age! What makes a workout dynamic? ★ The answers can be selected instead of entering by digits ★ For each correctly solved task, points are awarded. If you answer quickly, you will also get a bonus points for speed What makes customization flexible? ★ you can train one or several operations (a