“整十、整百数除以一位数”是苏教版教材三年级上册“两、三位数除以一位数”的第一课时。这一内容是在学生已经熟练掌握表内乘、除法的基础上,引导学生联系表内除法,通过类比推理直接得到除法算式的商。学好这部分内容,不仅可以帮助学生更好地理解和掌握两、三位数除以一位数的算理与算法,进一步发展口算能力,还能拓展学生解决问题的范围,使他们获得更广泛的数学活动经验,发展初步的推理能力,提升数学思维品质。也基于此,本节课教学,要注意处理好算理与算法的关系,演绎推理和合情推理的关 “The whole ten, the whole hundred divided by one digit ” is the first lesson of the Su teaching version of the third grade books “two or three digits divided by a number ”. This content is based on the students have mastered the table multiplication and division, based on the guide students to contact the division of the table, through the analogy directly to get the divisor formula business. Learning this part of the content not only helps students to better understand and master the arithmetic and algorithm of dividing the two or three digits by the one-digit number, further developing the ability of speaking and counting, but also broaden the scope of students to solve problems and make them more widely available The mathematical activity experience, the development of the initial reasoning ability, improve the quality of mathematical thinking. Also based on this, the teaching of this lesson, we should pay attention to dealing with the relationship between arithmetic and algorithm, deductive reasoning and co-reasoning off