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Chapter Four Numbers: Everyones language

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Match the words with the pictures, signs and numbers: a. b. 0 c. 5/8 d. e. f. g. 13 45 h. i. 8 210 j. 90 k. × l. m. 0.82 n. 45% 1.a decimal number 8. subtract; minus 2. a protractor 9. multiply (for measuring angles) 10. divide 3. a pair of odd numbers 11. a number showing 4. compasses degrees (for drawing circles) 12. a percentage 5. a fraction 13. a pair of even 6. zero numbers 7. add; plus 14. equals m h g l c b a d k e j n i 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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add v. Add…and…. plus plus prep. …plus…is…. subtract subtract v. Subtract…from…. minus minus prep. …minus…is…. equal(s) v. is

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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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One plus one equals two. 1+1=2 prep. Two minus one equals one 2-1=1 prep. Two multiplied by three is six. 2*3=6 adj. Four divided by two is two. 4÷2=2 adj. Add one and one 1+1 Subtract one from two 2-1 Multiply two by three 2*3 Divide four by two 4÷2 v. statements instructions

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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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A game: 24 points 81 2 4 8 2 6 8 minus 2 equals/is 6. × plus minus multiply divide 24 1 24 24 divided by 1 equals/is 24. 6 × 4 24 6 multiplied by 4 equals/is 24.

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A game: 24 points 52 1 7 × plus minus multiply divide

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A game: 24 points 45 9 5 × plus minus multiply divide

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A game: 24 points 32 6 8 × plus minus multiply divide

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A game: 24 points 26 4 8 × plus minus multiply divide

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Homework Recite the second paragraph Do exercise 2

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