Why, now, soroban? The soroban master who has taught to schoolchildren for almost 40 years, talks about the significance of consciously training with the old-style calculation tool in the age of the ubiquitous computer. According to him, the point of the progress in soroban is one's concentration. This is because they have to complete a lot of calculation within the time limit in the soroban promotion exam, so first of all, they should calm the mind and grasp test questions carefully and that's the necessary ability to pass the exam. In fact, all of those who passed the advanced level exam in his class develop great concentration. As a result, they have a good school record not only on math but also on other subjects. As this proves, soroban is not just a calculation tool but an excellent instructional tool itself.