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1、The world of numbers【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件about numbers VSCompetition【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件1.2, 4, 6, 8are even numbers, and 1, 3, 5, 7, 9are odd numbers. Question: 10 is an number and 45 is an number. evenodd【最新】七年级英语上册 Unit 4 The world of n
2、umbers 课件 牛津深圳版 课件2. 4.63 (four point six three ) is a decimal number.Question: Which of the following is a decimal numbers? A. 0.82 B. 5/8 C. 45%【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件3. , 5/8, 18/7 are fractions. A. 分数分数 B.度数度数 c. 小数小数Question: what does “fraction” mean?【最新】七年级英语上册 Uni
3、t 4 The world of numbers 课件 牛津深圳版 课件4. 3 plus 5 is 8. Question: what is 3 plus 3?3+3= 6【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件5. Three Three subtractsubtracted from twelve is nineed from twelve is nine. . Question: what is 10 minus 5?10-5=5Twelve Twelve minusminus three is three is nine.
4、nine.【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件 6. Two Two timestimes three is six. three is six.Two Two multipliedmultiplied by three makes 6. by three makes 6. Question: What is 20 times 8?20 8=160【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件7. 30 divided by 6 is 5. Question: what i
5、s what is 45 divided by 9? 45 9=5【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件8. 0.5 equals . What does “equal” mean?9. 700 means 70 degrees. 900 means ? to be the same with =【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件10. is 50 percent. Question: 68% is a .A.Percentage B. fraction C. d
6、ecimal number【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件1 a demical number2 a pair of odd numbers3 a fraction4 zero5 add; plus6 subtract; minus 7 multiply, times8 divide9 a number showing degrees10 a percentage11 a pair of numbers12 equalsA What do you know aboutjfcbalidhkge【最新】七年级英语上册 Unit
7、4 The world of numbers 课件 牛津深圳版 课件How many languages do you know?我每天早上7点钟起床。 I get up at 7:00 every morning. 私每朝 7时起。numbers: International languageNumbers: Everyones language【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件1.Title: _2.Headings: _ _ _Guess-The text is about the _ of numbers and th
8、e descriptions(描述描述) of three _ _ .Ancient numbersZerocalculating machinesNumbers: Everyones languagehistorycalculating machinesSkimming 【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件Before reading: Exercise B1.Long ago, there were different ways of writing numbers.2.The Egyptians first invente
9、d the 1 to 9 system of numbers.3.The zero is not a number. 4.The zero is an especially important number.5.Machines make it easier for us to calculate. 6.Your brain is an important part of your body. 【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件Intensive reading:1.How did people in ancient time
10、s count in the same way?They nearly all . 2. Which system of numbers did the Indians invented?The system of . 3. What invention helped people write in big numbers?The invention of . counted in tens1 to 9 zero the first 2 parts. 【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件A small machine that
11、uses A small machine that uses electronic power to do electronic power to do calculations. calculations. AnAn electronic calculator electronic calculator A very powerful machine for A very powerful machine for doing calculation. doing calculation. A A computercomputerA calculating machine with A cal
12、culating machine with wireswires and and beadsbeads. . An An abacusabacusCalculating machines【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件1.Features (特点）特点）: fast & accurate 2. What does beads on the wires stand for?3. Figure:Formulas thousandsthousands hundredshundreds tens tens onesonesan ab
13、acusan abacuswiresbeads5 7 2 41: 5724 0+1=？【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件A: What can an electronic calculator do?B: It can A: What else can it do?B: It can calculate _ and _. .an electronic calculatorAddSubtractMultiplydivide percentagessquare roots【最新】七年级英语上册 Unit 4 The world o
14、f numbers 课件 牛津深圳版 课件A computerHow quickly can a computer do a calculation?It can do calculation .in a flash 【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件Exercise B1.Long ago, there were different ways of writing numbers.2.The Egyptians first invented the 1 to 9 system of numbers.3.The zero is
15、 not a number. 4.The zero is an especially important number.5.Machines make it easier for us to calculate. 6.Your brain is an important part of your body. 【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件when and where can we see numbers in everyday life?Discussion :【最新】七年级英语上册 Unit 4 The world of
16、 numbers 课件 牛津深圳版 课件The oil costs ninety-eight point eight yuan.98.8point【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件Your temperature is thirty-seven centigrade(摄氏摄氏) degree（度）（度）.37centigrade degree【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件My home number is two five six one six eigh
17、t nine seven.2561 6897【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件Its nine past ten now.【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件（ 1879.3.14-1955.4.)EinsteinEinsteinHis birthday isMarch 14th.【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件Homework Exercise C1 and C2. 【最新】七年级英语上册 Unit 4 The world of numbers 课件 牛津深圳版 课件
