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数感是人们对数的感觉,对数的感知能力,是现代人必备的一种数学素养。数感好的学生,学习数学轻松愉快,接受能力强。《义务教育数学课程标准(2011)》中明确指出:“数感主要是指关于数与数量、数量关系、运算结果估计等方面的感悟。建立数感有助于学生理解现实生活中数的意义,理解或表述具体情境中的数量关系。”但在教学中,学生在解答题目时经常会出现一些如:教室门高2厘米、一个西红柿重约50千克、小明身高175米,此类明显的错误,学生怎么就会这么糊涂?本质原因是我们的学生没有良好的数
Feeling is the number of people feeling the logarithm of the perceived ability, is an essential modern mathematical qualities. Feeling good students, learning mathematics relaxed and happy, strong ability to accept. “Compulsory Education Mathematics Curriculum Standard (2011)” clearly states: “Sense of number mainly refers to the number and quantity, the relationship between quantity, the calculation of the results of estimation, etc. The establishment of a sense of number will help students understand the number of real-life Meaning, comprehension or expression of the relationship between the number of specific situations. ”But in teaching, students often appear in the answer questions such as: classroom door height 2 cm, a tomato weighs about 50 kg, Xiaoming height 175 meters, such as Obvious mistakes, how students will be so confused? Essential reason is that our students do not have a good number