championships, but you have no right, i am sim kashan bardia mirzaei, i am from alborz province, narges ghasemiakeh, isfahan, and from hormozgan province, tehran province, hamedan province , i am mohammad reza soltani, hamedan province, i am more interested the first math class is very weak and you do it by hand, then the math class was good again, and the children introduced my classmate to improve, then i went to register and saw that at first it was not very good , but then our interest was very strong . they have an abacus class for math calculations. today, i registered for abacus to strengthen intelligence, the ability to create coordination between the two hemispheres of the main brain, mental calculations and the use of shorts, which is about the activity of the two hemispheres. mental calculations for this works, when the children are activated bilaterally, it is much easier for them to learn their next skills , which means that many people think that mental calculations are only a matter of mathematics, and maybe in the case of children's dictation , children's scribbles are carefully