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小学数学第五册《两位数乘多位数》第一教时的教学重点是乘数十位上的数去乘被乘数,所得数的定位问题。为了使学生掌握用整十数乘两位数的计算方法,教材安排了两道准备题。根据目前农村小学学生的知识底子与接受能力。只凭这两道准备题的学习是还不够的,可在学生自学这两道准备题的基础上,补充几道如15与2个“+”相乘得30个“+”即300的练习题,先用横式口算答数后,再用竖式表示书写位置,如;为解决乘数十位上的数去乘被乘数,所得数的定位打下基础。(?)教学例1“12×34”时,不要急于出现坚式的计算方法,可启发和引导学生运
Primary school mathematics fifth volume “two digits multiply digit” The first teaching focus is to multiply dozens of places to multiply the number of multiples, the income of the positioning problem. In order to enable students to master the whole number by two double-digit calculation method, the textbook arranged two preparatory questions. According to the current rural primary school students knowledge and ability to accept. It is not enough just to prepare for the two exams. Based on these two preparatory exams, we can add several exercises such as multiplying 15 with two + to get 30 + or 300. Question, first with the cross-answer calculation, and then use the vertical position that writing, such as; to solve the number of multiples of tens to multiply multiples, the number of laid the foundation for the positioning. (?) Teaching Example 1 “12 × 34”, do not rush to appear a solid calculation method that can inspire and guide students to transport