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小学毕业前复习有关数的知识时,应注意从总体上进行归纳整理,使学生对已学过的数有比较完整、系统的认识。复习时可列出右表,并说明:一、零不是自然数,零和自然数都是整数。但不能说整数包括零和自然数。这就正确地反映了零、自然数和整数之间的关系,也为今后代数中引入负整数留下了余地。二、分数包括百分数,百分数是一种特殊的分数。通过比较9/100和9％的异同点可知,9/100后面可带吨、公里等单位名称,9％后面则不能带单位名称。由此看
When reviewing the relevant knowledge before graduating from primary school, you should pay attention to summarizing and summarizing it as a whole so that students have a complete and systematic understanding of the numbers that have been learned. Review the right table can be listed, and explains: First, zero is not a natural number, zero and natural numbers are integers. But we can not say that integers include zero and natural numbers. This correctly reflects the relationship between zero, natural numbers and integers, and leaves room for the introduction of negative integers in future generations. Second, the score includes the percentage, the percentage is a special score. By comparing the similarities and differences between 9/100 and 9%, we can see that units behind 9/100 can carry tons, kilometer and other units, and behind 9%, units can not be named. Look at this