At the beginning of the explanation of this topic, write the formula on the Board: "+6 = +10 -5 +1». Then we say: «Guys, the number 6 on soroban looks like this: 5 and 1, right? Six is five and one bone at the bottom. We all know that. Moreover, in order to add 6 on soroban 5, we use a mix formula that is written on the Board (also write an example on the Board: 5 +6 = _____). See: "+6 = +10 -5 +1». Let me show you how to solve this example on the big soroban, and you repeat after me in the air. To add 6 to 5, we add 10 with our left hand, and make -5 +1 with our right hand at the same time. How much did you get? 11! Right! (We add the answer 5 +6=11 on the Board, and solve the examples on the big soroban: 6+6, 7+6, 8+6, 15+6, 16+6, 17+6, 18+6, and 25+6 Children repeat in the air after the teacher. First, we write an example on the Board, and then only show the solution on the big soroban. Then all the children do FE on the formula mix under the dictation of the teacher: 5+6, 15+6, 26+6, 17+6, 8+6 and so on. After FE, two or three students go out to decide on the big soroban).

Mental score. Students present a soroban in front of them and quickly count on imaginary accounts. It is the mental account that develops both hemispheres of the brain: representing soroban works the right hemisphere, translating the image into numbers works the left hemisphere. In other words, logic, creative and analytical thinking, photographic memory, speed of reaction, and self-confidence increase. The lessons of mental arithmetic use flash cards that develop tasks, dictation by ear, mental dictation, relay races, which also develop fine motor skills of the hands, both hemispheres of the brain, auditory and visual memory, and as a result, improve grades in all subjects.

The manual is written by a teacher of mental arithmetic, chief methodologist, Director of education at the center for mental arithmetic. The author participated in the development of the method of mental arithmetic when it first appeared in the CIS countries. After analyzing the market, I noticed that former colleagues who also became professionals in this field began to open companies, centers, associations that issue certificates in mental arithmetic online training for teachers in mental arithmetic. They realized that the franchise is expensive, and it became cheaper to teach this course themselves.

3.10 Holidays. Before holidays or holidays, it is necessary to conduct a survey among parents in advance (5—7 days in advance) about whether they will be able to come to the lesson. If more than half (50%) of students are unable to attend the lesson, it is moved to another time convenient for parents. It is forbidden to cancel the lesson, because it is harmful: speed is lost, formulas can be forgotten if the homework was not done daily. Only in cases where parents strongly ask for rest, the lesson is moved to the whole week, and in this case, you need to give a detailed homework assignment and recommendations on what to do this week.

Now look at the formula I wrote on the Board: +7 = +10 -5 +2. Do you know why +2? Because the number 7 on soroban is 5 plus 2. Do you understand? Well done! Let’s solve an example: 5+7=_____. To solve this example, we can use the following formula. Let me show you how to solve this example on the big drum, and you repeat after me in the air. To add 7 to 5, we add 10 with our left hand, and make -5 +2 with our right hand at the same time. How much did you get? 12! Right! Now I will show you how to solve this example: 6+7, repeat after me in the air (we show several examples on the Board and a large soroban. We make sure that children repeat in the air. Then at the dictation of the FE teacher: 5+7, 6+7, 7+7, 15+7, 16+7, 17+7 and so on. After that, two or three students on the big drum solve the examples)».