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说明:本教材乘法口诀编排的顺序采用“小九九”先学2的乘法口诀(九句),再学3的乘法口诀(八句),依次学到5的乘法口诀。把1—5的乘法口诀作为第二年级第一学期学习的内容,6—9的乘法口诀为第二学期学习内容。采用倒三角形状的“小九九”,它的优点是乘积的数较小,学生容易记忆:一次教完几的乘法口诀,口诀的规律性非常明显,后面几句口诀学生会自己类推自编口诀。前面几句口诀已经学过,正好起了承上启下的作用;已学过的口诀可以得到反复练习,学习新的口诀逐渐减少,学生不会感到记忆与应用口诀的困难;2—5乘法口诀有35句,占乘法“小九九”口诀总数的7/9,这对学习相应的除法就有利,能沟通一乘两除的关系。
Description: The order of multiplication formulas of this textbook adopts the multiplication formula (9 sentences) of “XiaoyuJiu” first learning 2, and then learn the multiplication formula of 3 (8 sentences), and then learn 5 multiplication formulas. The 1-5 multiplication formula as the second grade first semester learning content, 6-9 multiplication formula for the second semester learning content. The use of inverted triangle shape “small ninety-nine”, which has the advantage of a small number of products, students easy to remember: teach a few multiplication formulas, the regularity of formulas is very obvious, behind a few formulas students will analogize their own analogy. The first few formulas have been learned, just played the role of link; learned formulas can be repeated practice, learning new formulas gradually reduced, students will not feel the difficulty of memory and application of formulas; 2-5 multiplication formulas 35 Sentences, accounting for the multiplication “small nine nine” formulas the total number of 7/9, which is beneficial to learn the corresponding division, can communicate one by two addition to the relationship.