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20以内进位加法是小学数学的重要基础。它对提高学生的计算能力有很大的影响。如何使学生既能牢固而灵活地掌握这部分知识,又能使学生的思维活跃、学得生动呢? 一、运用直观,讲清方法观察是认识事物和进行抽象思维的基础。为使学生掌握20以内进位加法的计算方法——“凑十法”,在教学中应注意引导学生观察事物的变化过程,以加深对“凑十法”的理解和运用。如教学9加几时,先出示图①,然后提问学生:“白球和东球合起来,
Addition within 20 carries is an important basis for elementary mathematics. It has a great impact on improving students' computing power. How to make students not only have a firm and flexible grasp of this part of knowledge, but also enable students to think actively and vividly? First, the use of intuition and clarification of method observation is the basis for understanding things and conducting abstract thinking. In order to enable students to grasp the method of calculating sums for carry within 20 - “Ten Steps in Consolidation”, students should be guided in their teaching to observe the changing process of things so as to deepen their understanding and application of the “Minato Ten Law.” Such as teaching 9 plus a few hours, the first show Figure ①, and then ask students: "White ball and the East together,