口算的正确、合理、迅速,反映了一个人数学素养的高低;口算是学生进一步学习笔算、估算和简算的重要基础;口算教学是训练学生思维能力和培养学生数感的重要手段;它是小学数学教学的一项基本任务。因此,教师要十分 Mouth calculation is correct, reasonable and rapid, reflecting the level of a person’s mathematical literacy; Mouth counting is an important basis for students to further their study, estimation and calculation; Mouth arithmetic is an important means of training students ’thinking ability and cultivating students’ sense of number; Primary school mathematics teaching a basic task. Therefore, teachers should be very good