《除数是两位数的除法》是小学生数学学习中的难点和重点之一,是整个小学阶段除法教学中的一个重要环节,具有承上启下的作用。在此之前学生接触的除法计算都可以归纳为简单的整数除法计算,不涉及到调商阶段。对于四年级学生来说,学习如何调商可以说是小学数学除法计算中一次重要的里程碑。对于初学者而言,试商的时候大都需要调商,一次计算难以成功,需要经历多次计算才能达到要求,这不仅考验学生的持续计算能力,而且还非常考验学生的学习耐性。因此。试商技 “Divisor is a double digit division” is one of the most difficult and important points in primary school mathematics learning. It is an important part of division teaching in primary school and has the function of connecting and disconnecting. Prior to the student contact division can be summed up as a simple calculation of the integer division, does not involve the transfer phase. For fourth graders, learning how to negotiate can be an important milestone in the calculation of primary school mathematics. For beginners, the trial time most of the need to transfer, a calculation is difficult to succeed, need to go through many calculations to meet the requirements, which not only test the students ’ability to continue computing, but also very test the students’ learning patience. therefore. Trial business skills