无锡市北塘区教研室曾对统编《数学》第一册《20以内的进位加法和退位减法》进行过一次口算调查。我们抽样分析了12个班的调查卷,其中错得最多的一道题为“15-4=9”。有九个班的392份调查卷,算错127题,占总题数32.4％;错得最多的一个班达到58.2％。在算错这道题的127份调查卷中,单独只错这一题的有73份,占57.4％。达到或接近口算速度标准的调查卷有94 Beitang District, Wuxi, teaching and research room once compilation of “Mathematics” Volume I “carry within 20 addition and abatement subtraction” conducted a port count investigation. We sampled and analyzed the survey of 12 classes, of which the most wrong one was “15-4 = 9”. There were 392 survey volumes in nine classes, accounting for 127 questions, accounting for 32.4% of the total; the most mistaken one was 58.2%. In the 127 surveys that miscalculated this question, 73 were the only ones on the wrong list, accounting for 57.4%. The survey volume that reached or was close to the standard rate of mouth count was 94