2 3 Subtract Integers
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2 3 Subtract Integers

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    2 3 Subtract Integers 2 3 Subtract Integers Presentation Transcript

    • Subtracting Real Numbers Chapter 2.3 Subtracting is the same as adding a negative!
    • Warm Up
      • What is the opposite of the following?
        • -14 +5.2 -19 19
      • What is the absolute value of the following?
        • -14 +5.2 -19 19
      • Find the sum
        • -5 + 8= -9 + -12=
    • Warm Up Answers
      • Just change the signs
        • +14 -5.2 +19 -19
      • Make them all positive
        • +14 +5.2 +19 +19
      • Find the sum
        • -5 + 8= +3 -9 + -12= -21
    • Subtracting Integers is really adding negatives
      • Find the sum 9 + (-6)
      • Find the sum 9-(+6)?
      • What do you notice about the two number sentences above?
      • +3
      • +3
    • Make a subtraction statement into an addition statement
      • Exchange the signs in the middle.
      • 4 – (+5) =
      • -9 – (+8) =
      • -57 – (+25) =
      • +87 – (+88)=
      • A minus sign IS a negative sign.
      • 4 + (-5)
      • -9 + ( - 8)
      • -57 +( - 25)
      • +87 + - 88
    • Two negatives make a positive.
      • 4 – (+5) = 4 + (-5)
      • Opposite
      • statements
      • 4 – (-5) = 4 + (+5)
      • Subtract a negative = add a positive.
    • How do you handle two negative signs in the middle?
      • -9 – (-8)
      • Change them both to positive
      • -9 - (- 8)
      • -9 + (+8)= -1
    • Try Some. Rewrite each statement
      • -57 – (-25)=
      • -17 – (-21)=
      • 7 – (-13)=
      • 8 – (-33)=
      • -5 – 15 =
      • -57 + ( + 25)
      • -17 + ( + 21)
      • 7 + ( + 13)
      • 8 + ( + 33)
      • -5 + - 15
    • And the answer is?
      • -16 – (-21)=
      • -83 – (-17)=
      • 83 – (-17)=
      • 47 – (-12)=
      • -9 – 22 =
      • -16 + (+21)= -5
      • -93 + (+17)= -76
      • 83 + (+17)= 100
      • 47 + (+12)= 59
      • -9 + - 22 = - 31
    • pg 71: 23 – 67 odds
    •