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Integers & Life

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Integers are used to represent many everyday situations. Weather above zero+ below zero- Business earnings+ debts- Sea Level above+ below- Golf above Par+ below Par- Body Mass gain+ loss- Bank Account Earnings+ debts- Stock Market net gain+ net loss-

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What is an integer? We measure temperature in degrees Celsius. The highest temperature in Prince George, BC, on April 27, 2004 was 12 o C. 12 is a positive number. 12 o C is the difference between the temperature of the air and the temperature at which water freezes, 0 o C. We may not be able to use a positive number to express a difference. For example, the temperature inside a freezer is 4 0 C less than the freezing point of water. We represent this difference as -4 0 C C is a negative number. We say negative 4.) A number with no fractional part. Includes the counting numbers {1,2,3,…}, zero {0}, and the negative of the counting numbers {-1, -2, -3, …} You can write them down like this: {…, -3, -2, -1, 0, 1, 2, 3, …}

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Use a positive or negative number to represent each situation. ~eight degrees above zero ~ten degrees below zero ~parking three levels below ground ~two points ahead in a game ~a loss of sixteen dollars ~taking four steps backward Express each change as an integer regarding stock prices on the Toronto Stock Exchange: The value of Apple Computers increased $2.00 Palm Tech dropped from $25.00 to MDS started the day at $13.00 and ended the day at $12.00 Steve bought Global stock at $10.00 and sold it for $15.00 Minds On: How can an integer be used to show the relationship between two prices of a stock? Explain.

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Minds On: The floors in the elevator at the Integer hotel are numbered from -3 to +7, with the street level lobby represented by L instead of zero. State which floor the elevator stops at after each of the following moves.

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Hello my name is Jeeves, welcome to my elevator. The person on my left is not permitted to be at this hotel, please phone security immediately! StartChange Where are you 0up 4, down 3, down 4, up 30 floor +2down 5, up 10, down 2, down 1+4 floor -3up 3, down 2, up 6, up 1, down 4+1 floor +6down 7, up 3, up 5, down 9 -2 floor +5up 2, down 5, down 3, up 1, up 7, down 8, up 5, up 3, down 7, down 1 -1 floor

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Positive and negative whole numbers are called integers. We put a + in front of a number to indicate it is a positive inte ge r. We put a – in front of a number to indicate it is a negative integer. We can show integers on a number line. The number line may be vertical, like a thermometer. A number line may be horizontal Opposite integers are the same distance from 0 but are on the opposite sides of 0. For example, +2 and - 2 are opposite integers. They are the same distance from 0 and are on the opposite sides of 0.

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