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本单元是在学生认识和掌握了万以内数的基础上,进一步学习认识万以上的数。这是认数范围的又一次扩展,是小学阶段对整数认识的终结,对发展学生的数感,培养学生的估计意识具有重要的意义。本单元的主要教学内容有:万以上数的读写;万以上数大小的比较;用“万”或“亿”作单位改写整万、整亿数;求一个数的近似数;数字编码。信息窗解读信息窗1图书知多少
The unit is based on the number of students to understand and master thousands, based on further learning to understand the number above. This is another extension of the range of recognition. It is the end of the elementary cognition in the primary school stage. It is of great significance for developing students 'sense of number and cultivating the students' sense of estimation. The unit's main teaching content: read and write more than the number of liters; comparison of the size of more than million; with “million ” or “billion ” as a unit to rewrite the whole million, Digital coding. Information Window Interpretation Information Window 1 books know how much