Our preschool class has this abacus calculation. I told the teacher not to let him attend. Later, the math teacher said there would be no impact and advised us to participate. I think if we are the only one in the class who doesn't attend abacus mental arithmetic class, I'm afraid it will have a bad influence on his psychology. Forget it, just follow. However, we are determined not to take extra abacus mental arithmetic classes. Personally, I am very opposed to mental arithmetic. What's the use? There is no point in practicing people into calculators. No matter how fast the calculation is, it is not as fast as a calculator. It is good for children to correctly establish the concept of numbers and master basic mathematics knowledge. The mathematics learned in the whole primary school and middle school is only the first few pages of advanced mathematics.