教师是凭借语言传递信息来进行教学活动的,所以要提高数学课堂教学效率,就必须提高信息载体——语言的功率。提高数学教师自身的语言修养,使用标准的数学语言就显得尤为重要。本单元的概念主要是名数、单名数、复名数三个。要由教师运用准确、科学、清晰的数学语言进行概括与表述,进而形成数学概念。如在理解单、复名数的区别时,应该让学生理解什么是量,必须是同类单位使用两个或两个以上才叫复名数。3平方米4吨就不是复名数,而3平方米4平方分米才是复名数。3平方米、4吨是两个单名数。
Grandpa was ill. He was lying on the bed all day. He looked haggard and frowned. Originally smooth and round face suddenly added a lot of wrinkles, black and shiny hair also lost the luster of the past, a few strands of white hair quietly climbed to the top of the head.
在我上学的日子里,幸好还有小猫陪在他身边,带给他一些快乐。希望爷爷早日好起来,继续和我一起幸福地生活。
In my school days, fortunately, there are also kittens around him to bring him some happiness. I hope Grandpa will get better soon and continue to live happily with me.
1、使学生认识“量”、“名数”、“单名数”和“复名数”的概念。
2、使学生理解、掌握把高级(低级)单位的单名数改写成低级单位(高级)单位的单名数的算理和方法,能正确、迅速地进行改写。
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