You have to use your head to live long.
Take care of your brain health by solving one problem a day!

As many brain science studies have shown, the way to maintain brain function and health for as long as possible is to keep your brain active.
In other words, the process of reading out loud, thinking through problems, and writing with a pen is the best way to slow down aging.
This book contains 100 problems that can strengthen cognitive abilities such as mathematical ability, concentration, and thinking skills through activities such as drawing shapes by connecting lines, comparing larger and smaller numbers, and calculating using multiplication and division.
It is not normal to feel physically or mentally unmotivated or to have poor memory.
Let's have the will to never neglect brain exercise, the effort to slow aging, and the confidence that we can do it! Let's start cognitive management to maintain a healthy brain until we're 100!