教学内容：六年制小学数学第四册第10贾例3及练习三的第1～4题。教学目的：1使学生初步认识连减两步应用题的结构，会用第一种解法（连减）分步列式解答。2通过教学，培养学生观察、比较，以及初步的分析、综合能力。教具准备：小黑板，三条长短不同、颜色各异的纸条。教学过程 Teaching content: Sixth grade primary school mathematics fourth volume tenth Jia example 3 and practice three of the first to 4 questions. Teaching Objectives: 1 to enable students to initially understand the structure of the subtraction two-step application questions, will use the first solution (minus) step-by-step solution. 2 through teaching, training students to observe, compare, and preliminary analysis, comprehensive ability. Teaching aids to prepare: a small blackboard, three different lengths, different colors of note. Teaching process