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《数学课程标准》指出:能估计运算的结果,并对结果的合理性做出解释。估算是发展学生数感的有效途径之一。人教版数学教材加强了估算教学的内容安排,二年级上册首次出现估算专项学习内容“加减法的估算”。然而学生估算意识的培养不是一朝一夕、一蹴而就的事情,这需要在长期的数学教学中不断渗透、潜移默化、坚持训练、逐步形成。因此,从一年级开始,我们教师在教学中就应该有意识地加强估算教学,培养学生的估算意识,发展学生的估算能力,
The Mathematics Curriculum Standard states that the results of an operation can be estimated and the justification of the result explained. Estimation is one of the effective ways to develop students’ sense of number. PEP mathematics textbooks to strengthen the content of teaching estimates, the first two books appeared on the estimation of special learning content “addition and subtraction method of estimation ”. However, the cultivation of student’s estimation consciousness does not happen overnight, and then overnight, which needs constant infiltration in the long-term mathematics teaching, imperceptibility, persistence in training and gradual formation. Therefore, from the first grade, we teachers should consciously strengthen the teaching of estimation, training students to develop a sense of estimation, the development of students’ estimation ability,