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课件网) 2 4 Amazing things Numbers Reading Before you read Why do we use machines to help us with mathematics What inveutions are mentioned in the video clip A0 Watch a video,then answer the questions. Because we can't calculate all maths problems ourselves. Numbers and systems like abacuses, electronic calculators and computers. Who invented and developed the number zero What is the most basic non-clcctric calculator What does an electronic calculator allow us to do What is the advantage of a computer What is the video clip mainly about It's about_____that make working with numbers easier. The Indians. An abacus It allows us to do all kinds of calculations It can solve complex problems in a flash. systems/inventions Before you read A0 Watch a video,then answer the questions. Before you read A1 Think and answer the questions according to last class What is the main purpose of the text a) To inform (告知) b) To entertain (娱乐) c) To persuade (劝说) Where can you probably find this article What type of text is this a) Narration b) Exposition c) Argumention In a history, math or science textbook, a magazine or on a website. subheadings pictures Before you read Subheadings divide the text into parts and tell the topic of each section. A1 Think and answer the questions according to last class direct and to the point 紧扣主题 interesting short and clear consistent一致性 What makes good subheadings e.g. asking a question length structure Ancient numbers Zero Calculating machines Brain against computer Are these good subheadings While you read B0 Think and answer the questions according to last class To grab the main idea ,what’s the second imporatant part subheadings Ancient numbers A topic sentence A topic sentence is the most important sentence in a paragraph. It summarizes the information in the paragraph. While you read B1 Read “Ancient numbers”and underline the topic sentence. In ancient times, people wrote numbers in many different ways, as these pictures of the number 6 show. However, they nearly all counted in the same way—in tens. Ancient numbers What else can be found in the text What is the main idea of the text pictures &examples Zero Most of us use the system of numbers with numbers from 1 to 9 and 0 (zero). With these ten numbers, we can write any number from the biggest to the smallest. The Indians first invented and developed the 1 to 9 system of numbers. They then invented the zero. This was a very important invention because it made it easier to write big numbers and to calculate. While you read B2 Read “Zero” and underline the topic sentence. What’s the use of this part reasons facts& Can you divide it further While you read B3 Read “Calculating machines”and underline the topic sentence. Calculating machines One of the first calculating machines was an abacus. Abacuses are so fast and accurate that people still use them today. A modern electronic calculator can add, su ... ...
