动手实践是学习数学的基本方法,已被广大老师所采用,但在实际教学中,动手实践活动还存在很多弊端,如:操作停留在模仿层面,为操作而操作;操作的目的性不强,难以展开有效探索;操作缺乏感性到理性的升华,思维张力不够;操作时机失当,没有突破关键问题;操作只是少数人参与,忽视了群体间的相互交流……凡此种种,都弱化了动手实践的价值。 Hands-on practice is the basic method of learning mathematics and has been adopted by the majority of teachers. However, there are still many drawbacks in practical teaching, such as: the operation stays at the level of imitation and operates for operation; the purpose of operation is not strong, Difficult to start an effective exploration; the operation of the lack of sensual to rational sublimation, thinking tension is not enough; operation timing is improper, did not break through the key issues; operation is only a few people involved, ignoring the interaction between groups ... All these weaken the hands-on practice the value of.