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苏教版小学数学四年级上册“用计算器计算”例1后有这样一句结语“用笔算或口算检验计算器算得是否正确”。笔者认为这一检验方法是不妥的,没有普遍性,甚至有些是无法进行或超出课标要求。教材中例1用计算器计算38+27,30×18这两题,结果用口算或笔算验算是可以的,但计算器的优点一般是用来计算有关大数的四则运算或较复杂的计算。如例题之后试一试中41600÷128,380×426。计算的结果用口算验算是不太可能的,用笔算验算也超出了课标要求。笔
Sujiao version of elementary school mathematics fourth grade on the volume “with the calculator to calculate ” Example 1 after such a sentence “using the pen or port count test calculator is correct ”. The author believes that this test method is not proper, there is no universality, and even some are unable to carry out or exceed the requirements of course standard. Example 1 with a calculator to calculate the 38 +27,30 × 18 these two questions, the results with the word count or pen calculation is OK, but the calculator is usually used to calculate the advantages of the four major calculations or more complex calculations . As an example after trying to try 41600 ÷ 128,380 × 426. Calculated results with the mouth count calculation is not possible, using pen calculations also exceeded the standard requirements. pen