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Positive and Negative Numbers

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Do Now Solve. 1. x + 4 = y – 2.3 = z = = 8 x = 15 y = 10.1 z = 30 Course 2 w9w9 w = 72 Hwk: p 39

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EQ: How do I add integers? 7A1b Evaluate algebraic expressions

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Definition Positive number – a greater than zero. Positive numbers are to the right of zero

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Definition Negative number – a less than zero. Negative numbers are to the left of zero

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Definition Opposite Numbers – numbers that are the same distance from zero in opposite directions

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Definition Integers – are the set of whole numbers and their opposites. -7 opposite 7

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Temperature is measured using positive and negative numbers.

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Negative numbers are used to measure the number of feet under the sea. Positive numbers are used for the number of feet above sea level

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Negative numbers show how much is owed. Joe borrowed money from the bank for a new computer. The printed bank statement looks list this: $-2,

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Positive & Negative Numbers Working with positive and negative numbers is like driving in traffic. Watch the traffic signs and follow the driving rules.

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Hint If you dont see a negative or positive sign in front of a number it is positive. 9 +

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Addition: Rule 1 Rule #1 – If the signs are the same, pretend the signs arent there. Add the numbers and then put the sign of the addends in front of your answer = = -14

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Practice = = (+3) + (+4) = = = =

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Addition: Rule 2 Rule #2 – If the signs are different, subtract the smaller number from the larger one. The answer takes the sign of the absolute value of the larger number = = 4 Larger number Answer = - 4

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Practice = = (+3) + (-4) = = = = -2 5 – 3 = – 9 = 0 9 – 5 = 4 7 – 6 = 1 4 – 3 = 1 7 – 4 = 3

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How are numbers added using a number line? When the number is positive count to the right. When the number is negative count to the left. +-

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How are numbers added using a number line? =-2

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How are numbers added using a number line? =+2

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How are numbers added using a number line? =-4

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How are numbers added using a number line? =+4

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How are numbers added using a number line? =+4

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How are numbers added using a number line? =+6

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How are numbers added using a number line? =-3

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How are numbers added using a number line? =-6

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How are numbers added using a number line? =-5

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How are numbers added using a number line? =-5

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How are numbers added using a number line? =-5

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How are numbers added using a number line? =5

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How are numbers added using a number line? =5

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How are numbers added using a number line? =6

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