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近日听说有一道判断题在全国小学数学教研微信群里引发讨论,让人颇感兴趣。原题是“两个小数相乘,积一定是小数。”还有补充说明:“争议:2.5×0.4=1.00,这个1.00是小数,还是整数?如果是小数,就对了,如果是整数,就错了。”大概是经历了一番讨论,未有统一意见,最后蔡金法老师为此题发表了自己的看法,其中说到,这道题本身没有问题,两小数的乘积一定是小数,而这里“整数1”是特殊的小数,正像整数1
Recently I heard that there is a judgment in the national primary school mathematics teaching micro-channel group triggered discussions, people are quite interested. The original question is “multiply two decimals, product must be a decimal.” “There are added: ” controversy: 2.5 × 0.4 = 1.00, the 1.00 is a decimal, or an integer? If it is decimal, right, if Is an integer, it is wrong. “” Probably experienced some discussion, there is no unified opinion, the last teacher Cai Jinfa expressed his views on this issue, which said that there is no problem with the problem itself, the product of the two decimals must be Is a decimal, and here “integer 1 ” is a special decimal, just like an integer one