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Ch.1, Sec 5&6: Adding Subtracting Integers
 

Ch.1, Sec 5&6: Adding Subtracting Integers

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Chapter 1, Section 5 and 6: Adding and Subtracting Integers.

Chapter 1, Section 5 and 6: Adding and Subtracting Integers.

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    Ch.1, Sec 5&6: Adding Subtracting Integers Ch.1, Sec 5&6: Adding Subtracting Integers Presentation Transcript

    • Chapter 1 Section 5: Adding Integers Section 6: Subtracting Integers By Ms. Dewey-Hoffman, 2009 http://msdhpowerpoints.blogspot.com/
    • Rules for Adding Integers
      • Adding Integers with the Same Sign:
        • The sum of two positive integers is positive.
        • The sum of two negative integers is negative.
          • Example: -12 + (-31) = -43
          • Example: 22 + 16 = 28
      • Adding Integers with Different Signs:
        • Find the difference (subtraction) of their absolute values . The answer has the sign of the integer with the greater absolute value.
          • Example: -125 + 35 =
              • |-125| + |35| =
              • 125 – 35 = 90
              • Biggest number is negative, so the answer is negative. -90
      • Addition of Opposites  It’s a property!
        • The sum of an integer and it’s opposite is zero.
          • Example: 7 + -7 = 0
      • Adding Integers
        • Turn it into a word problem and say it out loud.
          • Example: -1 + 4, You owe me 1 dollar, you have 4 to pay me back, how much do you have left over? 3.
          • Example: 7 + (-3), You have 7 dollars, you buy something for 3 dollars, how much do you have left? 4.
        • You give up negative numbers and you keep positive numbers.
        • Example Problems :
          • -2 + (-2) =
          • 2 + (-6) =
          • -4 + 9 =
          • -5 + (-1) =
      Adding Integers
    • Adding Integers with Different Signs: Example Problems
      • Remember: Find the difference of their absolute value. The sign of the number with the greatest absolute value gives the sign of the answer.
      • Also: Go left to right when all you’re doing is adding and subtracting!
      • 1 + (-3) + 2 + (-10) =
      • -250 + 200 + (-100) + 220 =
      • The elevation of a monitor in Pinon Flat, California, is 1,696 meters higher than the monitor in Hockley, Texas (at -416 meters). Find the elevation of the monitor in Pinon Flat.
      • Write an expression.
      • Solve.
    • Subtracting Integers
      • Add Its Opposite
        • Turn the subtraction sign into addition and take the OPPOSITE of the second number.
        • Then treat the problem as an addition problem. (Difference of absolute value, etc).
      • Example Problems:
        • 2 – 5 =
        • 44 – 100 =
        • 32 – (-3) =
        • -40 – 66 =
        • 2 – 48 =
        • The lowest temperature ever recorded in Antarctica was -89°C. The lowest temperature ever recorded on the moon was about -170°C. What is the difference in the temperatures?
    • Assignment #3
      • Pages 26-27: 21-32 all, 54-60 even.
      • Pages 31-32: 20-36 even, 57-61 all.
      • No extra credit today.
      • Remember to show work, set up your page correctly and box your answers!
      • Due September 4 th , 2009.