要培养学生准确迅速的计算能力,必须在理解算术知识的基础上,进行充分的练习。练习分课内和课外两种。课外练习是学生的独立作业,它是在课内练习的基础上进行的。课内练习,是在教师的指导下,巩固所学知识,进行基本技能的训练,同时也为课外的独立作业打下基础,提高练习效果。所以加强课内练习是非常重要的。 To develop students' accurate and rapid computing ability, they must practice well on the basis of understanding arithmetic knowledge. Practice sub-class and extra-curricular two. Extracurricular exercises are students' independent work, which is based on the practice of the class. Class practice is under the guidance of teachers, to consolidate the knowledge learned, basic skills training, but also lay the foundation for independent work after class to improve the practice effect. So it is very important to strengthen the class practice.