Unit2 第四课时 More practice 课件2024-2025学年沪教牛津版八年级上册

8A Unit 2 More practice COMPANY 1 2 3 4 After this class, you are expected to: understand the development of counting methods. retell the development of counting methods with linking words. know more ways of counting and have a better understanding of numbers. learn some new words and useful expressions related to counting. Learning Objectives Revision The king and the rice What tools did they use to count the amount of rice? Winner Systems of written marks 书面数字系统 The old man said, “If I win the game, I’d like one grain of rice for the first square of the chessboard, two for the second, four for the third, and then double the amount for each of the rest of the squares.” Chessboard Before the invention of written numbers, people used many different tools to count things. What other tools did people use to count things? Brainstorm Observe and say fingers toes marks on sticks and bones tokens（ 代币） made from clay（黏土） or small stones abacus The babylonians（巴比伦人） used clay to record transactions（交易情况）. In ancient China, people used the number of stones to count the number of objects. One stone means one, two stones mean two and so on. Marks &Tokens Guess and Think Can you guess the order of their occurring time(出现时间)? Think if the king and the old man can count the amount of rice by fingers/ toes/ marks on sticks and bones.....? And why? 1 2 设计思路：学生熟悉了不同的计数工具后，教师提出这两个问题，预设学生暂时无法回答。紧接着引导学生们先读完本课时的主课文counting before numbers，读后做完flow chart，第一个问题基本能回答上来。接下来再解决第二个问题。 1. What is the writing order of this article? Time order Place order Space order 2. This article mainly talks about the ____________ of counting methods. difference development design Look at the title, the pictures and every first sentence of each paragraph in the article. Then answer the following questions. Skimming Scan the article and then complete the flow chart about the development of counting methods. their fingers and even their toes small marks on sticks and bones tokens made from clay or small stones systems of written marks the Hindu–Arabic system Scanning TIPS: Linking words can make the article more logical. tokens made from clay or small stones fingers and toes marks on sticks and bones Do you know the order of their occurring time? 1 abacus Systems of written marks Intensive reading could count At first small numbers used fingers and toes At first, people used their fingers, and even their toes. However they could only count small numbers in this way. Finsh the chart and Find the facts: What is “this”? Intensive reading 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. After that began to make marks on sticks and bones helped… count bigger numbers like the days of the month the amount of food the number of animals Finsh the chart and Find the facts :What is “this”? Intensive reading 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. Then began to use to count even bigger numbers put…on… developed into tokens made from clay or small stones tools Finsh the chart and Find the facts :What is “this”? Intensive reading 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. Finally began to develop to show different numbers led to systems of written marks Hindu-Arabic system Finsh the chart and Find the facts :What is “this”? Think if the king and the old man can count the amount of rice by fingers/ toes/ marks on sticks and bones.....? And why? 2 Development is a process of finding and solving problems. No, because they can not count such large numbers like that. Counting before numbers After that tokens made from clay or small stones Then At first Finally systems of written marks fingers and toes marks on sticks and bones to count small numbers to count bigger numbers to count even bigger numbers to show different numbers the days of the month the amount of food the number of animals Time Things people used What to count Make a spidergram Examples develop into tools: abacus eg: Hindu-Arabic system more and more advanced Counting before numbers After that tokens made from clay or small stones Then At first Finally systems of written marks fingers and toes marks on sticks and bones to count small numbers to count bigger numbers to count even bigger numbers to show different numbers the days of the month the amount of food the number of animals Time order Things people used What to count Retelling Examples develop into tools: abacus eg: Hindu-Arabic system more and more advanced Homework compulsory: Complete the writing task and revise before handing in. Optional: Make an English vlog to introduce the changes happened in your life based on your composition. $$