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在低年级计算教学中,口算既是笔算、估算和简便计算的基础,又是计算能力的重要组成部分。因此,在计算教学中要注重让学生理解算理的基础上合理、灵活地掌握口算方法。为了让学生理解算理,我在课堂教学中充分利用了一种学具——数位筒。利用数位筒让学生理解算理—说算理—用算理,从而达到培养学生思维品质的目的。一、教学生做数位筒,认识数位。一年级学生的思维活动是以具体形象思维为主要形式,而数学知识具有一定的抽象性,这样使一年级学生的思维特点与数学学科特点形成了矛盾,自然形成了学生在认知方面的障碍。为了化解学生这一矛盾和学习障碍,我在教学一年级第一学期教学“11～20各数的认识”的第一课时中,引入了一个形象直观的学具“数位筒”。在课前让学生把两
In the teaching of lower grades, mouth arithmetic is not only the basis of calculation, estimation and simple calculation, but also an important part of calculation ability. Therefore, in the calculation of teaching should pay attention to allow students to understand the basis of arithmetic reasonable and flexible grasp of the word count method. In order to allow students to understand the arithmetic, I make full use of a learning tool in classroom teaching - digital tube. The use of digital tube allows students to understand the arithmetic - that arithmetic - using arithmetic, so as to achieve the purpose of cultivating students’ thinking quality. First, teaching students to do bit tube, know the digital. The thinking activity of the first grade students takes the concrete image thinking as the main form, and the mathematical knowledge has a certain abstraction, so that the thinking characteristics of the first grade students form contradictions with the characteristics of the mathematics and naturally form the students’ cognition obstacles . In order to resolve this contradiction and learning disabilities of students, I introduced an intuitive learning tool “Digital Cartridge ” in the teaching of the first semester of the first grade . Have students put two before class