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教学内容:小学《数学》第四册67页例3、例4。教学目的:通过运用教具、学具,让学生动手、动口、动脑。使他们在学习活动中建立“倍”的概念;理解求一个数的几倍是多少要用乘法计算的道理;学会解答比较简单的求一数的几倍是多少的应用题。教学过程: 一、基础训练 1.口算并说出算式的意义: 14×4= 20×4= 12×8= 15×3= 15×6= 42×2= 2.口答文字式题 5个4是多少? 8个7是多少? 4个12是多少? 4个20是多少? 通过基础练习,使学生由几个几向倍的概念转化,并为学习求一个数的几倍是多少打下基础。二、建立“倍”的概念
Content: Primary Mathematics, Book 4, p. 67 Example 3, Example 4. Teaching Objectives: Through the use of aids, learning tools, so that students hands, mouth, brain. So that they learn to create activities in the “times” concept; to understand how many times a number is calculated by multiplication truth; learn to answer simple how many times the number of applications. Teaching process: First, the basic training 1. Mouth calculation and say the meaning of the formula: 14 × 4 = 20 × 4 = 12 × 8 = 15 × 3 = 15 × 6 = 42 × 2 = How many? 8 7 is the number of? 4 12 is the number of? 4 20 is the number? Through the basic exercises, the students from several to several times the concept of conversion, and learning to find a few times the number is to lay the foundation . Second, the establishment of “times” concept