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教学内容:北京版《义务教育教科书·数学》四年级上册第19页。教学目标:1.通过估算与计算的巨大反差,加强学生对大数的直观感受,进一步认识大数;经历观察、猜想、实验、推理、对照的过程,利用可想象的素材,帮助学生感受1亿的大小,培养数感,发展空间观念。2.渗透“由部分推算出整体”的研究方法,使学生学会找可计数或直观看到的数
Teaching content: Beijing version of “compulsory education textbook · Mathematics” fourth grade on the 19th page. Teaching Objectives: 1. Through the huge contrast between estimation and calculation, to strengthen students’ visual experience of large numbers and to further understand the large numbers; to experience the process of observation, conjecture, experiment, reasoning and comparison, and to use the imaginable material to help students feel 1 The size of 100 million, the number of flu training, the development of space concept. 2. Infiltration “Part-by-part projections of the overall ” research method, so that students learn to find countable or intuitive to see the number