在许多国家的数学教材中,口算与估算都被列为重要的教学内容。目前,我们的口算与估算教学的严重不足,训练方法单一。学生缺少口算兴趣,没有自主口算与估算的意识,而且方法死、速度慢。新《数学课程标准》对九年义务制学校学生的口算与估算作了明确的要求。从某种意义上来讲,口算 In many countries, math teaching materials, accounting and estimation are listed as important teaching content. At present, we have a serious shortage of instruction and estimation teaching and have a single training method. Students lack of interest in calculating, no independent calculation and estimation of awareness, and the method of death, slow. The new “Mathematics Curriculum Standards” made clear demands on the calculation and estimation of nine-year compulsory school students. In a sense, the mouth count