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【片段与评析】□里可以填除0外的任何数“商不变性质”巩固练习片段在学生学习了商不变性质,完成了基本练习后,教师出示习题:在□里填上什么数,使商不变?(32×4)÷(8×□)=4(32÷4)÷(8÷□)=4(32÷□)÷(8÷2)=4(32÷□)÷(8÷□)=4反馈时,教师着重讲评最后一小题。整个过程如下:
【Fragment and comment】 □ can be filled in any number outside 0 “business invariant character ” to consolidate the practice fragment After students learn the invariable nature, after the completion of the basic exercises, the teacher to produce exercises: fill in (32 ÷ 4) ÷ (8 × □) = 4 (32 ÷ 4) ÷ (8 ÷ □) = 4 (32 ÷ □) ÷ (8 ÷ 2) = 4 □) ÷ (8 ÷ □) = 4 Feedback, the teacher focused on the last question. The whole process is as follows: