Hello! I am Lee Myung-ok, and I have been teaching abacus, mental arithmetic, and mathematics for a long time. Abacus and mental arithmetic classes offer many benefits, including not only improved calculation skills but also concentration, brain development, memorization, and memory, as well as increased patience. Achieving these effects requires about 2 to 3 years of consistent practice. Just as there is an optimal time for any study, the best age for abacus and mental arithmetic is between 5 and 7 years old, but it is a subject that can be learned by people of all ages. I will conduct responsible classes to ensure that all students achieve satisfactory results.