论文部分内容阅读
对于真分数与假分数的书写顺序,教材中无具体规定。教学中通行写法大致有三:一是自上而下,先写分子,再写分数线和分母;二是自下而上,先写分母,再写分数线和分子;三是先写分数线,再写分母,最后写上分子。一般而论,以第三种写法较为多见,但究其理由,却又不甚了了。笔者最近听一位教师教学“分数的意义”时,在学生深入理解分数的意义以及分母、分子、分数线意义的基础上,通过练习与谈话,对第三种写法做了精确恰当的解释,现录之以供参考。师:听写分数3/8。注意,你们先写什么?后写什么?为什么? 生:老师先说的是分数,所以先写分数线,再说平均分的份数,所以再写分母;最后说取出的份
For true scores and false points in the order of writing, no specific provisions of the textbook. Teaching is generally written in three ways: First, from top to bottom, first write molecules, write scores and denominators; second bottom-up, first write the denominator, write scores and molecules; third is to write scores, write the denominator Finally write the numerator. In general, the third wording is more common, but the reasons for it, but not quite. When I recently listened to a teacher's instruction of “the meaning of the scores”, the students explained the significance of the scores and the meanings of denominators, numerators and scores by means of exercises and conversations. Recorded for reference. Teacher: Dictation Score 3/8. Note: What do you write first? What to write? Why? Students: The teacher first refers to the score, so first write the score line, say the average number of points, so write the denominator;