一、揭示论题教学“小数乘以整数”时,笔者在黑板正中央写下“6.5×4”后,同学生进行了如下谈话:同学们,这是一道小数乘以整数的计算题,本节课我们共同来研究它的算法和结果,因为结果只有一个,而算法可能很多,所以我建议大家在马上要进行的分组合作学习中,先设法把结果确定下来,然后再考虑它的算法,这样可能会少走一些弯路,避免一些错误。赏析:研究题具体简明,新颖独特,“谈话”以商量 First, to reveal the subject of teaching “decimal multiplied by an integer”, the author wrote in the middle of the blackboard “6.5 × 4”, the following conversations with students: Students, this is a decimal multiplication by the integer calculation problems, this section We work together to study its algorithms and results, because the result is only one, and the algorithm may be a lot, so I suggest that you immediately in the group cooperative learning, first try to determine the results, and then consider its algorithm, so May take less detours, to avoid some mistakes. Appreciation: research questions concise, novel and unique, “talk” to discuss