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终于找到了美版新加坡数学，非常好，1A,1B, workbook & textbook
Primary Mathematics U.S. Edition Teacher's Guides provide, in both flexibility and detail, a clear framework for the Primary Mathematics textbooks. Each lesson is accompanied by numerous activities which expand and reinforce the concepts for that lesson and which are designed to fit both teachers who wish to adapt lessons to their own classroom situation, and teachers who desire easy-to-follow, effective teaching strategies. Through the notes to the teacher and the detailed objectives for each learning task in the text and activity in the guide, these Teacher Guides help teachers to fully understand the purpose and concept behind each set of problems, both within the context of the unit and the context of the overall curriculum. The teacher's guide contains answers for the textbooks and workbooks.
This version of Teacher's Guide can be used with Primary Mathematics U.S. Edition textbooks and workbooks. It cannot be used with Primary Mathematics Standards Edition or Common Core Edition books.
它有3个优势很值得我们借鉴：
1、新加坡数学独有的“CPA教学法”，又称“三步教学法”。这个教学法最早是美国的心理学家杰罗姆 · 布鲁纳提出来的，他经过观察发现，孩子学习，要经历三个阶段：
C - Concrete 具象化
P - Pictorial 形象化
A - Abstract 抽象化
2、新加坡数学有轻松打败应用题的绝招——Model-Drawing建模。数学学习中有一个大怪兽叫“应用题”，新加坡数学的建模，能帮助孩子深度理解并正确解答应用题。如果看了我们今天主文的爸爸妈妈，大概已经完全get了。这里再简单说一下，其实建模就是把一个问题，用图表的形式展现出来，最后用数学方法解答。
3、新加坡数学的难度跟国内接近，且在国际上处于领先。新加坡数学比国内更注重孩子透彻理解数学概念，解题思路更灵活。在“国际教育成就评价协会”（IEA）最新公布的“国际数学和科学评测趋势”（TIMSS）测试结果中，新加坡的中小学生在数学和科学科目的测试中取得了第一。这样的成绩，他们已连续获得多次。
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