Heart-brain calculation is the only simple calculation method without any physical objects. Heart-brain calculation is different from "abacus-brain calculation" and "hand-brain calculation", which requires neither heart-brain abacus nor fingers. Mental arithmetic (mental arithmetic, mental arithmetic, pen arithmetic) is consistent with the calculation method of primary school mathematics. The patent teaching method of mental arithmetic (mental arithmetic, mental arithmetic and written arithmetic) is the best way for children to pass oral arithmetic and written arithmetic in primary school. 1: mind-not only let children know arithmetic, but also let children know arithmetic in their hearts. Let children understand the arithmetic of calculation and break through the calculation of numbers in spelling. The child completes the calculation on the basis of understanding. 2. Brain-It is not just learning to calculate, but focusing on cultivating children's mathematical thinking ability, so that children can deeply understand the essence of mathematics (including), the meaning of numbers (cardinal number, ordinal number, including), the operation mechanism of numbers (addition and subtraction of the same number of digits) and the way of mathematical logic operation, so that children can master the method of dealing with complex information decomposition, and divergent thinking and reverse thinking can be developed. The child's brain works fast. 3. Calculation-It is not enough to know how to calculate a problem. There should be a time limit for oral calculation in primary schools. It takes time for oral calculation to reach the standard, but it is not enough to do the problem, mainly to speed up. At present, China's education system is exam-oriented education, and the standard for testing students is exam transcripts. Then the students' main tasks are to take exams, answer questions and write with a pen. Students in exam-oriented education should get high marks, and writing arithmetic training is the main line of teaching. Written calculation does not use any physical calculation, regardless of horizontal, vertical, and even addition and subtraction can be calculated freely.

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