数感主要是指对数与数量表示、数量大小比较、数量和运算结果的估计、数量关系等方面的感悟。它是一种主动地或自动化地理解数和运用数的态度与意识。数感的建立是学生数学素养提高的重要标志。在教学中加强估算教学,培养学生的估算意识,提高学生的估算能力,是学生拥有良好数感的重要途径之一。在估算教学中,我们要多引导学生结合实例,利用自己的生活经验和直觉进行猜测与估算,强化对数据的认知,形成较强的量化能力,同时还能估计 Sense of number mainly refers to the number of logarithms and the number of said, the number of the size comparison, the number and calculation of the results of the estimation, the number of relationships and other insights. It is a kind of attitude and awareness of understanding numbers and using numbers initiatively or automatically. The establishment of number sense is an important symbol of improving students’ mathematical quality. In teaching to strengthen the estimation of teaching, training students to raise awareness of estimation, improve students’ ability to estimate, is one of the important ways for students to have a good sense of number. In the estimation teaching, we should guide students to use examples to make use of their own life experience and intuition to guess and estimate, strengthen the cognitive data to form a strong quantitative ability, but also to estimate