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“倍”的概念是小学数学基础知识之一。人教版九年义务教育教材是在讲了乘法的意义之后,在“用口诀求商”的应用题中。引进“倍”的概念的。可是在教学中往往遇到这样的情况:要求学生说出2的3倍是多少?即2×3=6,学生即会回答说:“6是2的3倍”,变成了6÷2=3。这样使我们思考一个问题:对于小学生,究竟是用乘法的意义来建立“倍”的概念,还是用除法来建立“倍”的概念?考虑到以后
The concept of “times” is one of the basics of elementary mathematics. People's Education Edition nine-year compulsory education textbook is about the significance of multiplication, the “use of formulas to find business,” the application problem. The introduction of “times” concept. However, teaching often encountered such a situation: ask students to say 2 times the number of 3? That is 2 × 3 = 6, students will reply: “6 is 2 times 3” into a 6 ÷ 2 = 3. This allows us to ponder the question of whether pupils should establish the concept of multiplication in the sense of multiplication or the concept of multiplication in terms of multiplication,