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本单元教材是在学生掌握了20以内数的读写和十以内加、减法计数的基础上进行教学的。主要讲一位数加一位数得数超过10的进位加法以及相应的退位减法。教学要求是: 1.使学生正确、迅速地计算20以内的进位加法和退位减法; 2.使学生初步认识简单应用题的结构,会解答求总数和求剩余数的加、减法应用题。 这一部分内容是多位数四则计算的基础,也是进一步学习数学必须练好的基本功之一。 教材中还出现少量的十几加几的不进位加法和十几减几的不退位减法的练习题,这是为了进一步
The unit teaching material is in the students mastered the number of liters and less than 20 liters and ten plus, subtraction count based on teaching. Mainly speaking a digit plus a number of more than 10 carry addition and the corresponding abatement subtraction. Teaching requirements are: 1. To enable students to correctly and promptly calculate carry addition and abort subtraction within 20; 2. To enable students to initially understand the structure of simple application questions, will answer the total number and seek the remainder of the addition and subtraction application questions. This part of the content is based on the calculation of multi-digit four, but also one of the basic skills to further learn mathematics must be good. Textbook also appeared in a small amount of more than a dozen do not carry addition and a dozen minus a few do not abate subtraction exercises, which is to further