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Chapter Four Numbers: Everyone’s language

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**Match the words with the pictures, signs and numbers:**

a. ＋ b c. 5/8 d. e. f. ＝ g h i j. 90 k. × l. m n. 45% a decimal number subtract; minus 2. a protractor multiply (for measuring angles) divide 3. a pair of odd numbers a number showing 4. compasses degrees (for drawing circles) a percentage 5. a fraction a pair of even 6. zero numbers 7. add; plus equals d m h k e g l j n c b i a f

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**Read the article and tell whether the following statements are true or false.**

( ) 1. In ancient times, numbers were written in different ways, but counting was nearly always in tens. ( ) 2. Everyone uses the numbers system 1 to 9 plus 0 (zero). ( ) 3. The numbers system was invented by the Chinese. ( ) 4. Zero makes it even more difficult to write big numbers and to calculate. ( ) 5. People use abacuses, calculators and computers to calculate. ( ) 6. Calculators cannot calculate percentages and square roots. ( ) 7. Computers can work only when human beings program them with instructions. T T F F T F T

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**equal(s) v. add v. Add…and…. plus prep. …plus…is….**

+ add v. Add…and…. plus prep. …plus…is…. - subtract v. Subtract…from…. minus prep. …minus…is…. equal(s) v. is =

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**multiply v. Multiply…by…. …multiplied by…is…. times prep. …times…is….**

× multiply v. Multiply…by…. …multiplied by…is…. times prep. …times…is….

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divide v. Divide…by…. …divided by…is…. ÷

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**statements 陈述，说明 instructions 指示，指令 Add one and one 1+1**

One plus one equals two =2 prep. Two minus one equals one =1 Two multiplied by three is six *3=6 adj. Four divided by two is two ÷2=2 statements 陈述，说明 Add one and one Subtract one from two Multiply two by three *3 Divide four by two ÷2 v. instructions 指示，指令

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**＋ plus minus × multiply/multiplied divide/divided**

2 ＋ 3 ＝ 5 5 2 ＝ 3 2 × 3 ＝ 6 6 2 ＝ 3 2 plus 3 equals/is 5. 5 minus 2 equals/is 3. 2 multiplied by 3 equals/is 6 6 divided by 2 equals/is 3.

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**8 1 2 4 A game: 24 points ＋ plus minus × multiply divide 8 2 ＝6**

equals/is 6. 6 × 4 ＝24 6 multiplied by 4 equals/is 24. 2 4 24 1 ＝24 24 divided by 1 equals/is 24.

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A game: 24 points 5 2 ＋ × plus minus multiply divide 1 7

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A game: 24 points 4 5 ＋ × plus minus multiply divide 9 5

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A game: 24 points 3 2 ＋ × plus minus multiply divide 6 8

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A game: 24 points 2 6 ＋ × plus minus multiply divide 4 8

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Homework Recite the second paragraph Do exercise 2

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Objective - To simplify expressions using the order of operations.

Objective - To simplify expressions using the order of operations.

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