口算是估计和笔算的基础,口算能力差,势必会影响到估算、笔算的正确和速度,影响计算技能的形成。《数学课程标准》中强调重视口算,加强估算,提倡算法多样化。在“数的运算”中,中段放在第一条的就是“会口算百以内一位数乘、除两位数。”要求我们重视学生的口算训练。要提高学生的口算能力,必须抓好四个方面:一、理清算理,掌握口算方法首先,《数学课程标准》中明确提出了要加强算理和算法教学。口算的算理是说明口算过程的依据和合理 Mouth calculation is the basis for estimation and pen calculation, poor accounting skills, is bound to affect the estimation, calculation accuracy and speed, affecting the formation of computing skills. “Mathematics Curriculum Standard” emphasis on port count, strengthen the estimation, to promote the diversity of algorithms. In the “number of operations ”, the middle of the first paragraph is “will be counted within a hundred multiples of one hundred, in addition to two digits. ” We are required to attach importance to the student’s oral arithmetic. In order to improve the students’ abilities, we must do a good job in four aspects: First, clarify the arithmetic and grasp the method of calculating. First of all, “Mathematical Curriculum Standards” clearly put forward to strengthen the teaching of arithmetic and algorithm. Mouth arithmetic is to explain the basis of the Mouth calculation process and reasonable