The curriculum standard divides the curriculum content into four parts: number and algebra, shape and geometry, statistics and probability, synthesis and practice. And put forward 10 core concepts related to content: number sense, symbol sense, spatial concept, geometric intuition, data analysis concept, calculation ability, reasoning ability, model idea, application consciousness and innovation consciousness, and gave a clear explanation to each core concept./kloc-0 10000.0000000000606 The function of number sense is to establish number sense. The formation of number sense is a long-term process, which students can't feel in a day or two, or they can feel it well in this respect, and they need to gradually accumulate such an understanding of logarithm in their activities. In other words, it is necessary to accumulate relevant experience, so teachers may need to pay more attention to this point in teaching. 2. Understanding of symbolic consciousness. Symbol consciousness mainly refers to the ability to understand and use symbols to express numbers, quantitative relationships and changing laws. Is to use symbols to express their own meaning, to express numbers, quantitative relations and changing laws, which is a layer of meaning. Another layer means knowing that symbols can be used for operation and reasoning, and in addition, a conclusion can be drawn, which is general.