《义务教育数学课程标准》指出:“估算在日常生活与数学学习中有着十分广泛的应用,培养学生的估算意识,发展学生的估算能力,让学生拥有良好的数感,具有重要的价值。”教师是课程实施的引领者,只有教师重视估算教学,学生才会主动学习估算,其中首先要培养学生的估算意识,让学生认识到估算也是解决问题的一种重要手段,估算意识的培养是一个隐形的教学目标,它不是一两次的教学就能培养起来的,它需要教师结合教材和练习有意识、有目的地渗 The standard of compulsory education mathematics curriculum states: “Estimation has a very wide range of applications in daily life and mathematics learning. It is of great value to develop students 'estimation awareness, develop students' estimation ability and give students a good sense of number. ”Teachers are the leaders of the implementation of the curriculum, only teachers attach importance to the estimation of teaching, students will take the initiative to learn estimation, which first of all to develop students' awareness of the assessment, so that students recognize that estimation is also an important means to solve the problem, Is an invisible teaching goal, it can not be cultivated by one or two teaching, it requires teachers to combine teaching materials and practice consciously and purposefully