章颖

摘 要：在研究教材、课堂实施的过程中，发展“四基”达成学习目标，引领学生在数学活动中经历“思考、猜想、验证、质疑、再思考、再猜想、验证结论”的过程，帮助学生积累基本数学活动经验，对于教师有效开展教学活动具有重要的现实意义。教材是实现课程目标的有效载体。教师在备课时，研读课本的主题图和关键语句，挖掘在教材背后具有内隐性的思维活动经验，从而帮助学生亲身经历数学活动的过程。在学习过程中发展操作经验，逐步积累形成学生个性化的数学基本活动经验，在活动中激发学生的数学学习兴趣，获得对于数学的体验和认知，提高数学思维的能力。数学基本活动经验依存于“数学实践活动”中，人教版一年级下册数学实践课“摆一摆、想一想”，是一节运用“猜想”帮助学生积累数学活动经验的典型课，本文以这节课为例，从激活已有经验，获得思考经验，开放猜想经验，深化积累经验四个方面，形成板块式推进学生经验的学习。

关键词：思考;猜想;验证

【中图分类号】G622.0    【文献标识码】A       【文章编号】1005-8877（2021）07-0187-02

Accumulate Experience of Mathematical Activity in “Guessing”

——Take “Take a Look and Think About it” as an Example

ZHANG Ying  （Xiamen Minli No.2 Primary School in Fujian Province，China）

【Abstract】In the process of research and teaching material，classroom implementation，development of “four base” to achieve learning goals，lead students in mathematics activity experience “thinking，guessing，validation，questioning，and think，guess again，verify the conclusion” process，help students to accumulate experience，basic mathematical activities for teachers to carry out teaching activities efficiently has important practical significance.The teaching material is an effective carrier to realize the course goal.When preparing for the class，teachers should study the theme map and key sentences of the textbook and dig out the implicit thinking activity experience behind the textbook，so as to help students experience the process of mathematics activity in person.Develop operational experience in the learning process，gradually accumulate and form studentspersonalized basic experience of mathematics activities，stimulate studentsinterest in mathematics learning in the activities，obtain experience and cognition of mathematics，and improve the ability of mathematical thinking.Mathematical fundamental activity experience on “mathematics practice” o clock book1&book 2 grade one pendulum is a “，think ”mathematics practice lesson，is a section with“ guess ”mathematical activities help students accumulate experience of a typical class，based on this class as an example，from the experience，experience thinking，open speculation experience，deepen the accumulate experience from four aspects，form BanKuaiShi to promote students learning experience.

【Keywords】 Thinking;Guess;Validation.

1.情境導入，激活已有经验

（1）教师出示数位表，学生回忆名称和意义。

师：小朋友们，你们还认得这位老朋友吗？谁能来介绍一下它，比比谁的记性最好？

生1：它是“数位表”，右边起第一位是个位，第二位是十位。

生2：把十位和个位上的数合起来，可以组成两位数。

师：看来小朋友们对“数位表”都非常熟悉了！“数位表”里的小圆片很顽皮，我们一起来听听关于它的小故事吧！……