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义务教育六年制数学第九册第7页例5以菜价的计算为例引出了积的近似值这一教学内容,教材注明由于在实际生活中收付现款时,通常只算到分,所以计算结果要保留两位小数。通过这一例题,使学生明确钱数的计算结果如果超过两位小数,通常只精确到百分位。但教材对于钱数是整数或一位小数的情况出现了前后表现形式不一的模糊现象,给学生学习造成混乱,教者也感到捉摸不定。如课本第8页第4题,第12页第9题、第13页第13题、第42页第2题、第102页第1题等都是按
Example 5 Taking the calculation of the vegetable price as an example, this article introduces the approximate value of the product. The teaching materials indicate that since the cash is usually collected and paid in real life, Therefore, the calculation results to retain two decimal places. Through this example, to make students calculate the number of money more than two decimal places, usually only accurate to the percentile. However, the textbook appeared to have a vague appearance of different forms before and after the number of money is an integer or a decimal, causing confusion to students' learning. Teachers also feel uncertain. Such as textbook page 8 page 4, page 12 page 9, page 13 page 13, page 42 page 2, page 102 page 1 and so on are all according to