牛津深圳版英語七上74《the world of numbers》之五-預(yù)覽頁
【正文】 em of numbers? ? The 1 to 9 system. ? 5 The invention helped people write in big numbers. ? What invention? ? The invention of the zero. ? 6 They are fast and accurate. ? What? ? Abacuses. ? 7 Computers are very powerful ones. ? Very powerful what? ? Calculating machines. Homework ? 1. 聽錄音 ,跟讀課文 3遍 ,家長簽名 ,并在課文中找到以下 詞組 : ① 至少 ⑤幫助某人做某事 ②在古代 ⑥代表 。 times ? 8 divide ? 9 a number showing degrees ? 10 a percentage ? 11 a pair of even numbers ? 12 equals ? A + ? B 0 ? C 5/8 ? D 247。 E = F 13 45 G 8 210 H 90176。 20% 60% We can use them to calculate. an electronic calculator a puter an abacus Calculating machines an electronic calculator add subtract multiply divide percentage square root calculate Calculating Machine Calculating Machine beads wires 5,7 2 4 — thousands — hundreds — tens — ones an abacus A What do you know about…? 1 a decimal numbers 2 a pair of odd numbers 3 a fraction 4 zero 5 add。 62176。 times 8 divide 9 a number showing degrees 10 a percentage 11 a pair of even numbers 12 equals A + B 0 C 5/8 D 247。minus ? 7 mutiply。 H 90176。 plus minus multiply divide Review the words 1 plus 3 is four Calculate… 1+3=4 5 minus 2 is three 52=3 3 multiplied by 9 is 27 3 9=27 9 divided by 3 is 3. 9 247。 Write down your name, please ! 電腦可以在一瞬間完成計算 . 1. at least 至少 2. in ancient times 在古代 3. consist of 由 … 組成 4. in many different ways 以很多種方式 5. help sb (to ) do sth. 幫助某人做某事 6. stand for = represent 代表 。 6 10 + 90 10 5 50247。 ” to get 24.) 6 divided by 3 is2. 7 multiplied by 2 is 14. 10 plus 14 is 24. Who is the first to get 24? Let’s do a sum!! It takes the spaceship 90 minutes to go around the earth once. How many times does it go around the earth a day? Answer: 16 90 minutes = hours 24
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