2.5 More practice（同步课件）-八年级英语上册同步精品课堂（沪教牛津版） （广州深圳沈阳通用）

英语（牛津版） 八年级 上册 Unit 2 Numbers English More practice Before the invention of written numbers, people used many different ways to count things. What tools did people use to count things? Brainstorm 1 课堂导入 one two three four seven eight nine ten ten five six How to use your fingers to count numbers? fingers stick 棍子 toes Tools to count numbers abacus Tools to count numbers written number system 书面数字系统 token 陶筹 clay 黏土 Before the invention of written numbers, people used many different ways to count things. At first, people used their fingers, and even their toes. However, they could only count small numbers in this way. After that, they began to make small marks on sticks and bones. This helped them count bigger numbers. They used them to count things like the days of the month, the amount of food and the number of animals they had. Then people began to use tokens made from clay or small stones. This helped them count even bigger numbers. They often put the tokens on pieces of string so that they could carry them around easily. This developed into tools like the abacus. Finally, people began to develop systems of written marks to show different numbers, and. This led to the Hindu-Arabic system (0—9). We are still using this system today. Read the article. 2 课堂活动 This article mainly talks about the ____________ of counting methods. difference development design skimming Before the invention of written numbers, people used many different ways to count things. Finally, they began to develop(4)______________________ This led to (5)_______________________________ used their fingers, and even their toes. small marks on sticks and bones. First, people used(1)___________________________________ After that, they made(2)_______________________________ Then they used(3)_____________________________________ tokens made from clay or small stones. systems of written marks