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教学内容:上海九年制义务教育课本四年级第二学期例4、例5。教学目标:1.知道正、负数加减混合式题的运算顺序。2.会正确地进行正、负数加减混合式题的运算。教具准备:卡片、幻灯、小黑板、玻璃片。教学过程:一、复习1.计算两道正、负数连加、连减式题。(-23)+(-15)+82 (-23)-(-15)-822.口算练习师:这些算式可以怎么读?-4-8 12-20 -9+14生:“-4-8”读作负4减8,还可以读作负4与负8的和……看卡片,直接写出得数(集体练
Teaching content: Shanghai nine-year compulsory education textbook fourth grade second semester Case 4, Example 5. Teaching Objectives: 1. Know the positive and negative addition and subtraction mixed-type operation sequence. 2. Correct, positive and negative addition and subtraction mixed type of operation. Teaching aids to prepare: cards, slides, small blackboard, glass. Teaching process: First, the review 1. Calculate two positive and negative even plus, even minus type questions. (-23) + (- 15) +82 (-23) - (- 15) -822. 口口 练 Practitioners: How can these formulas be read? -48 12-20 -9 + 14 生: “- 4- 8 ”read minus 4 minus 8, you can also read as negative 4 and negative 8 and ... ... look at the card, write the number of direct (collective practice