口算是数学教学的重要内容,新课标指出“应重视口算,加强估算,提倡鼓励算法多样化”。而实际教学情况表明,近几年学生口算的速度和正确率明显下降,口算方法缺失,这成为课改后数学教学中的一大 Mouth arithmetic is an important part of mathematics teaching, the new curriculum standard pointed out that “should pay attention to port count, strengthen the estimation, to promote the diversification of encouragement ”. The actual teaching shows that in recent years, the speed and accuracy of the students decreased significantly, the lack of port count method, which became mathematics teaching after class teaching a large